Candolleomyces sp.
Candolleomyces sp.
Candolleomyces sp. is a small brown lawn and wood-chip mushroom found worldwide, identified to genus level but not yet narrowed down to a single species. The genus was split off from Psathyrella in 2020 and has grown from 25 named species to 73 in five years. Most unlabelled cultures trace back to the pale brittlestem, the common lawn mushroom that gave the genus its name.
Candolleomyces D. Wächt. & A. Melzer 2020 — Family: Psathyrellaceae — Order: Agaricales
Candolleomyces sp. is not a species name. It is the label a culture library uses when an isolate has been placed in the genus Candolleomyces but has not been resolved to a species, and it is worth understanding exactly what that abbreviation is admitting. Candolleomyces is a young genus, erected in 2020 to hold species pulled out of Psathyrella, and it has expanded from 25 species to 73 in five years. Its members are brittlestems, thin-fleshed brown mushrooms that fruit on lawns, wood chips and buried hardwood. This guide covers what is documented for the genus, what is documented only for the type species, and where the record is genuinely blank.
What Is Candolleomyces sp.?
Candolleomyces sp. refers to a living isolate assigned to the genus Candolleomyces without a species determination attached. The abbreviation "sp." is standard mycological shorthand for a single unidentified species within a named genus. On a culture label it carries real information, because the genus placement is usually secure while the species placement is not. That distinction matters more in this genus than in most, for reasons covered below.
The genus sits in the Psathyrellaceae, the family that also contains the inkcaps, whose gills dissolve into black liquid as they mature. Candolleomyces species do not do this. Their gills darken to purple-brown and stay intact, which is the quickest field separation from the inkcaps growing alongside them. They are saprotrophs, meaning they feed on dead organic matter rather than on living hosts, and they are recorded from soil, from wood, and very occasionally from dung.
The formal generic description is unusual because it is built largely on an absence. Candolleomyces is defined by having no pleurocystidia, the sterile cells that most related genera carry on the flat faces of their gills. The veil is fibrous to granular and vanishes quickly, the spores are medium-sized and pale to moderately dark, and the germ pore at the spore tip is central but frequently invisible under a microscope. A diagnosis resting on missing structures is a diagnosis you cannot apply in the field.
A wild collection of Candolleomyces sp. cannot be identified to genus without microscopy, because the defining character of the genus is the absence of pleurocystidia rather than the presence of anything visible. Genus placement in practice comes from sequencing, not from looking at the mushroom.
Which species is behind a Candolleomyces sp. culture?
In commercial terms, an unlabelled Candolleomyces sp. isolate is most likely Candolleomyces candolleanus, the pale brittlestem. Four lines of evidence point that way. It is the type species of the genus, it is the only member with a genuine common-name footprint in English, it is by far the most widespread and commonly collected, and it is the only species with multiple maintained laboratory strains on record. Strains Pc-5, Pc-6C, Pc-620, HLS-2, RM-0861, CMU-8613 and P9 are all published under that name.
Interested in this species? Out-Grow carries a liquid culture.
Candolleomyces sp. Liquid CultureHow Is Candolleomyces sp. Classified?
| Rank | Classification |
|---|---|
| Kingdom | Fungi |
| Division | Basidiomycota |
| Subdivision | Agaricomycotina |
| Class | Agaricomycetes |
| Subclass | Agaricomycetidae |
| Order | Agaricales (the gilled mushrooms) |
| Family | Psathyrellaceae (brittlestems and inkcaps) |
| Genus | Candolleomyces D. Wächt. & A. Melzer 2020 |
| Type species | Candolleomyces candolleanus (Fr.) D. Wächt. & A. Melzer |
| Index Fungorum | 832256 (genus), 832265 (type species) |
| MycoBank | Not recorded for genus or type species |
Candolleomyces sp. naming history and authorship
The genus was erected by D. Wächter and A. Melzer in 2020, in a paper proposing a subdivision of the family Psathyrellaceae published in Mycological Progress. Some catalogue entries and vendor listings credit the genus to "Wartchow 2020," which is incorrect. Index Fungorum records the authorship as Candolleomyces D. Wächt. & A. Melzer, Mycologia Progress 19(11): 1228, 2020, under record 832256.
The reason a new generic name was needed at all is a piece of nomenclatural housekeeping. Psathyrella candolleana was itself the type species of Psathyrella. When molecular work split the old broad genus apart, the clade containing that type could not simply keep the name Psathyrella for the fragment it landed in without renaming everything else, so a new genus was created around it. The basionym, meaning the original published name that the current combination is based on, is Agaricus candolleanus Fr. 1818.
The synonym list for the type species runs to roughly 45 names, which is a direct measure of two centuries of splitting based on appearance alone. Hypholoma appendiculatum, Drosophila candolleana, Psathyra candolleana, Psathyrella appendiculata, P. elegans, P. microlepidota and P. proxima all resolve to the same organism. GBIF accepts the species under taxon key 12008655 and NCBI Taxonomy uses taxid 71730.
Candolleomyces sp. species count and description rate
Species inflation in this genus has been fast enough to matter for anyone buying a culture. Wächter and Melzer transferred 25 species out of Psathyrella at the point of erection. By January 2025 the count stood at 63. By August 2025 it had reached 73 worldwide, distributed as 51 in Asia, 11 in Europe, 6 in North America, 3 in Africa and 1 in South America. A single 2024 study added seven Chinese species on its own.
The geographic breakdown is a sampling artefact as much as a biological pattern. With only six described North American species against 51 Asian ones, North American and African Candolleomyces diversity is almost certainly undersampled rather than genuinely low.
How Do You Identify Candolleomyces sp.?
Genus-level identification of Candolleomyces sp. requires a microscope, and species-level identification frequently requires sequencing on top of that. The description below is for the type species, the pale brittlestem, since it is the only member of the genus with a thorough published morphology and the most likely identity behind an unlabelled culture.
European accounts give consistently smaller dimensions than North American ones, down to 6 cm caps and 3 to 5 mm stipes, which is one of several hints that more than one taxon is circulating under the same name. Field observers describe the stipe as hollow like a dandelion stalk, with a scurfy white veil pattern, and the cap as strongly hygrophanous, meaning it changes colour visibly as it dries out. Flesh is very thin. Odour and taste are not distinctive.
Candolleomyces sp. lookalikes and dangerous confusions
Galerina marginata
Deadly. Contains amatoxins, the same class of compound found in the death cap. More orange-brown overall, usually with a ring on the stipe, and a rusty brown rather than purple-brown spore print. This is the confusion that matters.
Hypholoma fasciculare
Sulphur tuft, poisonous. Yellow-green gills when young rather than whitish to lilac-grey, and an intensely bitter taste. Grows in dense clusters on stumps in the same habitats.
Psathyrella incerta
Separable only microscopically, on smaller spores measuring 6 to 7.5 by 3.5 to 4 µm. Macroscopically it is effectively the same mushroom.
Psathyrella hymenocephala
Young cap cinnamon rather than honey, spores 6 to 9 by 3.5 to 5 µm. Another microscopy-only separation.
Psathyrella piluliformis
Darker and smaller, fruiting in large troops directly on hardwood stumps rather than scattered in turf.
Coprinopsis and Coprinellus species
Inkcaps in the same family and often the same lawn. Their gills deliquesce into black fluid at maturity. Candolleomyces gills never do.
Species complex warning. The type species of Candolleomyces sp. is repeatedly described in the literature as a complex of several closely related taxa rather than a single species. British treatments call it "a species complex yet to be sorted out," and MykoWeb calls a complex "possible if not likely." Any culture sold under this genus should be understood as an isolate of unresolved species identity, not as a verified single species.
Candolleomyces sp. DNA barcoding limits
Sequencing does not fully close the gap, and the reason is specific. In the companion revision of Psathyrella, ITS homology below 97 percent supported two collections being different species, but values above 98 percent were explicitly labelled inconclusive. Within-clade pairwise ITS distances averaged 0.006 even between species that were morphologically distinct.
Two concrete examples show the scale of the problem. The two marine species described in 2023 differ by only 2.6 to 3.2 percent ITS. Candolleomyces eurysporus shares 98.7 percent ITS with C. aberdarensis while remaining a separate species. A single ITS read is therefore not enough to convert a Candolleomyces sp. culture into a species name, and honest vendors do not pretend otherwise. Published phylogenies for the genus use ITS, nuclear LSU, tef-1α and beta-tubulin. No RPB2 dataset exists for the genus at all.
Where Does Candolleomyces sp. Grow?
Every described member of Candolleomyces sp. is saprotrophic. The generic description records terrestrial and lignicolous habits, meaning growth from soil and from wood, with rare records from dung. The type species is the ecological generalist of the group and is worldwide in distribution, appearing alone or in loose groups in lawns, pastures, cultivated ground and woodland.
The substrate detail that matters most for cultivation is easy to miss in the field. Fruit bodies that look terrestrial are usually rising from buried wood, wood chips or hardwood root systems rather than from soil organic matter. Vouchered collections place it on fallen elm, bur oak, hackberry and linden in woodland duff. Fruiting is rain-triggered, arriving in sudden flushes after heavy summer rain rather than on a predictable calendar.
| Region | Season and status |
|---|---|
| Britain and Ireland | June to November |
| Minnesota, USA | Late spring to early autumn |
| East and Central Texas, USA | Spring to fall, peaking in late summer |
| North America generally | Throughout the USA and southern Canada, most common in the Northeast and West Coast |
| Warm climates | Potentially year-round where moisture allows |
| Iraq | First reported 2014, sub-arid Aljazira region |
| Genus diversity centre | Asia, holding 51 of 73 described species |
Conservation status is unremarkable and reflects how common the type species is. The IUCN Red List does not list it, NatureServe ranks it NNR, meaning unranked, and it carries no state-level listing in Minnesota. No conservation assessment exists for the genus as a whole, which is unsurprising for a group where most members were described in the last five years.
Can You Cultivate Candolleomyces sp.?
You can grow the mycelium easily and quickly. You cannot reliably fruit it, and it is important to be direct about why. There is no published or vendor-documented protocol for fruiting any Candolleomyces species. Searches of the cultivation literature, substrate and yield studies, biological efficiency data, spawn-run figures, fruiting-trigger reports, forum grow logs and vendor catalogues return no primary cultivation reports for the type species or for any congener.
Substrate formulations, yield figures, biological efficiency percentages, spawn-run durations, fruiting triggers, casing requirements and flush counts are all unrecorded for this genus. What does exist is a solid body of work on axenic culture, meaning pure culture free of other organisms, and on submerged fermentation in liquid. That is the honest cultivation story for Candolleomyces sp., and it is a genuinely useful one.
Candolleomyces sp. agar culture parameters
The most useful dataset comes from a culture study on Psathyrella and coprinoid collections grown on malt extract agar and potato dextrose agar at 25 °C and pH 5.5. All collections formed white, cottony colonies with well-developed aerial mycelium, denser on potato dextrose agar and faster on malt extract agar.
At more than 15 mm per day the fast strain is in oyster mycelium territory, so this is not a slow genus. Culture micromorphology on malt extract agar shows frequent clamp connections, hyphal loops, anastomosis where hyphae fuse, rare chlamydospores, and Hormographiella-type arthrospores in older cultures. Those arthrospores, which are fragmentation spores formed from the hyphae themselves, matter operationally. Arthrospore-forming cultures are prone to sectoring and to carry-over during liquid transfers.
One ageing trait is worth knowing before it worries you. The endophytic strain P9 grown on potato dextrose agar at 28 °C produced white colonies with dense mycelium after six days and a small amount of yellow pigment at the later stage. Late yellow pigment in this genus is a normal ageing characteristic, not automatically a sign of contamination. Vegetative hyphae are colourless, thin-walled, septate and multinucleate.
Candolleomyces sp. liquid culture behaviour
Liquid culture is the best-evidenced use of this genus, which is why a Candolleomyces sp. liquid culture is a reasonable thing to own even without a fruiting protocol. A defined submerged medium for strain HLS-2 built from potato extract 4 g/L, glucose 20 g/L, peptone 1 g/L, potassium dihydrogen phosphate 3 g/L and magnesium sulphate heptahydrate 3 g/L produced a dense mycelial mass within three days at 28 °C and 150 rpm.
Enzyme output from the same system gives a sense of how metabolically active the mycelium is. Laccase, a copper-containing enzyme that oxidises lignin and a wide range of aromatic pollutants, reached roughly 4,600 U/L by day six. Adding 1 percent wheat bran raised that to about 12,000 U/L. Adding 1 mM copper sulphate raised it to roughly 23,000 U/L, a fivefold increase over the baseline.
Expand to agar
Streak or wedge onto malt extract agar at 25 °C, pH 5.5. Expect visible radial growth within 24 hours and a colonised plate in under a week from a healthy strain.
Build liquid culture
A glucose and peptone base with potassium and magnesium salts gives dense mycelium in three days at 28 °C on a shaker at 150 rpm. Static jars work more slowly.
Inoculate grain spawn
Standard sterilised grain spawn colonises readily. This is the practical route to outdoor wood-chip bed trials, which is the only fruiting pathway anyone has suggested.
Run enzyme or degradation work
Copper induction at 1 mM raises laccase output roughly fivefold. Wheat bran supplementation raises it too. Both are documented for this genus specifically.
Guard against inkcaps
Keep plates and outdoor beds away from Coprinopsis and Coprinellus material. These are the evidenced competitors, not the usual green moulds.
Refresh from agar regularly
Arthrospore formation in older cultures drives sectoring. Return to a stored agar master rather than serially transferring liquid to liquid.
Candolleomyces sp. contamination risks
The contamination risk for this genus is unusually specific and well documented. Dual-culture trials pitted Psathyrella isolates against related fungi on shared plates. The isolates overgrew Coprinus comatus in 69.5 percent of pairings, so they are not weak competitors in general. Against Coprinellus species they were overgrown in 55.5 percent of pairings, and against Coprinopsis in 36.1 percent, with growth-rate indicators falling by up to 54.0 percent.
Those inkcap genera occupy exactly the habitats this genus comes from, which are lawns, wood chips and enriched soil. Inkcap contamination is therefore the specific evidenced risk in both agar work and outdoor bed trials with Candolleomyces sp., ahead of the Trichoderma problems that dominate most cultivation advice.
Vendor-reported cultivation claims for Candolleomyces sp.
One vendor account, which should be read as unquantified vendor claim rather than trial data, states that the pale brittlestem is rarely if ever cultivated commercially because of its brittleness, short shelf life and low culinary value. The same source suggests it can be grown experimentally on leaf litter, sawdust or wood chips in shaded, humid, organically rich beds in spring or autumn, while acknowledging that environmental control is difficult and yields unpredictable.
The only peer-reviewed statement pointing the same way is that strain RM-0861 is "cultivatable in laboratory conditions." That means laboratory culture, not fruiting. No numbers accompany any of these claims, and no independent replication exists.
What the Candolleomyces sp. liquid culture is for
This liquid culture contains live mycelium of a Candolleomyces isolate suspended in sterile nutrient broth, ready to inoculate agar or grain. Realistic applications are agar expansion and strain maintenance, grain-spawn inoculation for outdoor wood-chip bed experiments, laccase and beta-glucosidase enzyme work, wood-degradation and metabolite studies, and teaching aseptic technique on a fast, forgiving organism. It is not a reliable route to a harvest, and no responsible source will tell you otherwise. Liquid culture viability and shelf-life data have not been published for this genus.
What Bioactive Compounds Does Candolleomyces sp. Contain?
All published chemistry for Candolleomyces sp. comes from the type species, and most of it comes from cultured mycelium rather than from fruit bodies. Nothing has been published for the genus as a whole. Evidence quality is flagged on every entry below, because the range runs from fully solved chemical structures to a survey whose reported compound identities do not hold up to scrutiny.
Psathyrellins A to E
Five previously undescribed guanacastane diterpenoids isolated from cultures rather than fruit bodies. Psathyrellin A has formula C₂₀H₂₈O₄ and was obtained at 6 mg and above 95 percent purity. Antibacterial MIC 16 to 128 µg/mL against four bacterial strains. Evidence: strong structures, in vitro only.
Psathyrelloic acid
A single-ring diterpenoid from fermentation culture, yielding 2.1 mg from 180 rice-medium bottles. MIC 16 µg/mL against Staphylococcus aureus. MIC means minimum inhibitory concentration, the lowest dose that stops visible growth. Evidence: single lab, milligram scale.
Endophyte metabolites
From a strain living inside Ginkgo biloba seed. Ergosterol, 2′-hydroxychalcone, myristic acid, quercetin, uracil and nicotinamide were recovered. Quercetin gave MIC 0.3906 mg/mL against S. aureus. Evidence: moderate, compounds are widespread and not species-diagnostic.
Fruit-body extracts (Turkey)
Total antioxidant status 5.547 ± 0.173, total oxidant status 8.572 ± 0.217, oxidative stress index 0.155 ± 0.001. Antimicrobial activity at 25 to 400 µg/mL and an antiproliferative effect on A549 lung cells. No MIC or IC₅₀ reported, and no DPPH, FRAP or GAE values exist. Evidence: cell line only.
Mosquitocidal extract
Methanol extract against Culex quinquefasciatus gave LC₅₀ 166.713 ppm and LC₉₀ 259.17 ppm at 24 hours, with 88 percent ovicidal activity at 500 ppm. No activity against Aedes aegypti or Anopheles stephensi. Evidence: single study.
Laccase
Up to roughly 23,000 U/L in copper-induced submerged culture from strain HLS-2, which is described in that work as an edible white-rot fungus. This is the most commercially relevant output from the genus. Evidence: strong, replicated within the study.
Beta-glucosidase
From endophytic strain P9 at 5.64 U/mL before optimisation, relevant to glycyrrhizin biotransformation. The P9 genome carries 210 glycoside hydrolases among its carbohydrate-active enzymes. Evidence: strong, genome-supported.
Iraqi GC-MS survey
A Mosul study reported three principal compounds and microplate inhibition of Bacillus cereus, E. coli, S. aureus, Candida albicans and Aspergillus niger, without numerical MICs. Evidence: weak. The reported compound identities are chemically implausible for a fungal extract.
Human clinical evidence for Candolleomyces sp. does not exist. No randomised controlled trial, no human intervention study and no case series has been published for any species in the genus. The closest work tested aqueous fruit-body extracts of strain RM-0861 against doxorubicin-induced DNA damage in human lymphocytes, using chromosomal aberration, micronucleus and comet assays. Extracts reduced micronucleus formation, showed neither genotoxicity nor cytotoxicity, and gave the largest reduction in chromosomal aberrations at all time points. No quantitative values were reported.
Any medicinal framing for this genus should stop at "preclinical, in vitro." The genoprotection result is interesting and it is real, but it was measured in cells in a dish, not in people, and it was reported without numbers.
Is Candolleomyces sp. Safe to Eat?
No toxin is known from the type species of Candolleomyces sp., and no poisoning syndrome is attributed to it. European field-guide consensus is "edible but not worthwhile." Other guides list it as inedible or of unknown edibility. Wikipedia calls it edible and possibly good-flavoured but not recommended, on the grounds of thin flesh and identification difficulty. MykoWeb records it as edible and unsubstantial.
That consensus is about worth rather than danger. The mushrooms are insubstantial, they disintegrate quickly after picking, they turn mushy within a day or two, and they dry poorly. Expert foragers generally leave them alone. One consumer reference notes that toxicological studies have confirmed no lethal poisons and recommends 10 to 15 minutes of boiling if the mushrooms are eaten at all.
The real hazard is misidentification, not toxicity. Deadly Galerina marginata and poisonous Hypholoma fasciculare both occur in the same habitats and at the same times. A genus whose own diagnostic character requires a microscope is a poor candidate for confident field eating. Cultures and liquid culture of Candolleomyces sp. should be treated as research and decomposer material, not as food.
Known toxins
None identified in the type species. Toxicity data for the other 72 described species in the genus does not exist.
Reported adverse effects
Vendor-reported minor gastrointestinal upset from old or poorly prepared material, usually traced to spoilage or misidentification rather than to the species itself.
Psilocybin
Not present. Analysis of five collections found psilocybin, baeocystin and related tryptamines absent at a detection limit of 0.005 percent dry weight.
Drug interactions
None documented. No pharmacokinetic or interaction study exists for any species in the genus.
Does Candolleomyces sp. contain psilocybin?
This question comes up often enough to deserve a direct answer. At least one consumer database asserts that the type species "may contain psilocybin or psilocin," and search data shows people looking for exactly that. The primary literature contradicts it.
Stijve and Kuyper analysed five collections of the species from Switzerland, Washington DC and Ottawa and published the results in Persoonia in 1988. Psilocybin, baeocystin and related tryptamines were absent at a detection limit of 0.005 percent dry weight. An earlier HPLC signal near psilocybin's retention time could not be confirmed by thin-layer chromatography. The correct editorial line is that no psilocybin has been confirmed in this genus, and that the psychedelic claim traces to disputed 1980s reports that failed replication.
What Makes Candolleomyces sp. Remarkable?
Candolleomyces species that fruit in seawater
The strongest oddity in this genus arrived in 2023. Two species from mangrove deadwood in Guangdong, China, Candolleomyces brunneovagabundus and C. albovagabundus, produce sequestrate fruit bodies, meaning the spore-bearing tissue stays enclosed rather than opening out into exposed gills. The enclosed cap and inner veil complex then detaches from the stipe and drifts away on the sea, which is where the epithet vagabundus comes from.
Paired germination trials compared freshwater agar against seawater agar at 10.4 parts per thousand salinity. Colonies on the seawater plates emerged obviously faster and denser, and spores germinated at a significantly higher rate. The authors describe both species as salt-preferring and probably obligately adapted to the marine environment. Fruit bodies developed from primordium to spore release in about five days while being periodically submerged by the tide, with mycelium turning from white to ginger-yellow after three to six days. Germination percentages and radial growth rates were not reported, so the adaptation remains unquantified.
Candolleomyces sp. as a plant endophyte
A lawn saprotroph is not where you expect to find an endophyte, meaning a fungus living inside healthy plant tissue without causing disease. Strain P9 was isolated from inside the root of licorice, Glycyrrhiza uralensis, in Xinjiang, and produces beta-glucosidase relevant to the biotransformation of glycyrrhizin. A separate strain was recovered from Ginkgo biloba seed. That is notable ecological breadth for a group usually written off as ordinary lawn fungi.
Candolleomyces sp. genome data
Three genomes have been published, all within the type species and C. eurysporus. Strain CMU-8613 from soil in Michoacán, Mexico was assembled from combined Illumina and Nanopore reads into 55.9 Mb across 771 contigs with a contig N50 of 183 kb and 96.7 percent complete BUSCOs. Strain VTCC 930004, the type material of C. eurysporus from Vietnam, came in at 70.0 Mb across 1,966 contigs with 16,680 predicted genes and 50.0 percent G+C content.
The endophyte P9 genome runs to 52,355,782 bp with 50.21 percent G+C and 13,397 coding genes. Its ITS sequence clusters with a database entry for the same species at only 90 percent similarity, which is a neat illustration of the reference-data problem discussed earlier. Three genomes across 73 species means no comparative genomics is possible for the genus yet.
Why Candolleomyces sp. is defined by absent characters
Candolleomyces sp. is one of the few genera whose concept rests almost entirely on negatives. The absent pleurocystidia are the diagnostic character. The germ pore is central but often invisible. The veil is present but vanishes quickly. Even the generic name exists only because a nomenclatural type had to be moved out of the way. Very few agaric genera are defined this thoroughly by absence, and it is the reason field identification to genus is unreliable without a microscope.
Candolleomyces sp. research gaps and open questions
The gaps in this genus are large and easy to state. There is no cultivation science of any kind, with no substrate trial, no biological efficiency figure, and no fruiting-trigger data for any species. The type species complex remains unresolved because ITS cannot separate its members. No RPB2 dataset exists. Standard antioxidant metrics including DPPH, FRAP and GAE have never been measured. No spore Q ratios have been published, and clamp connections are recorded only from cultured mycelium and not from fruit bodies.
For a genus that gained 48 species in five years, this is an unusually thin foundation. Anyone working with a Candolleomyces sp. culture is working close to the edge of what is known, which is either the appeal or the drawback depending on why you bought it.
Also available as a culture plate from Out-Grow.
Candolleomyces sp. Culture PlateFrequently Asked Questions About Candolleomyces sp.
What does "Candolleomyces sp." mean on a culture label?
It means the isolate has been placed in the genus Candolleomyces but has not been resolved to a species. The abbreviation "sp." is standard mycological shorthand for one unidentified species within a named genus. In this genus that label is more honest than it might look, because ITS barcoding above 98 percent similarity is explicitly inconclusive for separating Candolleomyces species, and the type species is itself widely regarded as an unresolved complex. Most unlabelled isolates are likely to be Candolleomyces candolleanus, the pale brittlestem.
Is pale brittlestem poisonous?
No toxin has been identified in the pale brittlestem, and no poisoning syndrome is attributed to it. Toxicological studies have confirmed no lethal poisons. The real hazard is misidentification rather than the mushroom itself, because deadly Galerina marginata and poisonous Hypholoma fasciculare occur in the same lawns and wood chips at the same times of year. Minor gastrointestinal upset has been vendor-reported from old or poorly prepared material, generally traced to spoilage rather than to the species.
Is pale brittlestem edible?
Technically yes, practically no. European field-guide consensus is "edible but not worthwhile," and MykoWeb records it as edible and unsubstantial. The flesh is very thin, the fruit bodies disintegrate quickly after picking, they go mushy within a day or two, and they dry poorly. Some guides list it as inedible or of unknown edibility. Given that the genus itself cannot be confirmed without a microscope and that lethal lookalikes share its habitat, it is a poor choice for the table regardless of its chemistry.
Is pale brittlestem psychedelic?
No. Stijve and Kuyper analysed five collections from Switzerland, Washington DC and Ottawa in 1988 and found psilocybin, baeocystin and related tryptamines absent at a detection limit of 0.005 percent dry weight. An earlier HPLC signal near psilocybin's retention time could not be confirmed by thin-layer chromatography. At least one consumer database still repeats the claim that the species "may contain psilocybin or psilocin," but that claim traces to disputed 1980s reports that failed replication.
Can you fruit Candolleomyces sp. mushrooms?
Not by any documented method. No published or vendor-documented fruiting protocol exists for any species in the genus. Substrate formulations, yields, biological efficiency, spawn-run duration, fruiting triggers, casing requirements and flush counts are all unrecorded. What is well documented is vegetative growth. The mycelium runs at up to 15.3 mm per day on malt extract agar and reaches dense mass in liquid culture within three days at 28 °C and 150 rpm. Vendor accounts suggest experimental outdoor wood-chip beds, but no quantified trial supports them.
What contaminates Candolleomyces sp. cultures?
Inkcaps, specifically. Dual-culture trials showed Psathyrella isolates overgrowing Coprinus comatus in 69.5 percent of pairings, but being overgrown by Coprinellus species in 55.5 percent and by Coprinopsis in 36.1 percent, with growth-rate indicators falling by up to 54.0 percent. Those genera occupy the same lawns, wood chips and enriched soil this genus comes from, so they are the specific evidenced risk in both agar work and outdoor beds. Arthrospore formation in older cultures also drives sectoring, so refresh from a stored agar master rather than transferring liquid to liquid.