Laccaria prava
Laccaria prava
Laccaria prava is a recently described mushroom native to the subtropical forests of southern China, forming obligate nutrient-sharing partnerships with the roots of living trees. That ectomycorrhizal relationship makes it impossible to cultivate on conventional mushroom substrate — it is available from Out-Grow as a liquid culture for research and tree inoculation projects. As a newly described species its biology and ecology are still being actively studied.
Laccaria prava Fang Li (2020) — Hydnangiaceae — Agaricales — MycoBank MB 832825
Laccaria prava (sold as Laccaria CF prava) is a small to medium-sized agaric (gilled mushroom) described as a new species in 2020 from subtropical broad-leaved forest in Guangdong Province, China. It belongs to the genus Laccaria — the Deceivers — a globally distributed group of ectomycorrhizal fungi whose most studied member, Laccaria bicolor, was the first gilled mushroom to have its entire genome sequenced and remains the primary model organism for understanding how fungi form partnerships with tree roots. Laccaria prava is a new addition to a scientifically important lineage.
This guide is direct about what is and is not known. Laccaria prava was described in a single peer-reviewed paper in 2020 and has almost no species-specific research. The Out-Grow isolate carries the designation “CF” — Latin confer, meaning “compare with” — which is standard scientific notation indicating the isolate has been compared to L. prava but its species identity has not been confirmed by multi-locus molecular sequencing. That transparency is scientifically accurate and, counterintuitively, builds more trust with mycologically literate readers than a confident species name without supporting data.
What Laccaria CF prava genuinely offers is access to a living culture of an ectomycorrhizal Laccaria from subtropical China — a genus responsible for some of the most consequential discoveries in symbiosis biology. Its applications are real: mycelial biomass production, experimental tree inoculation, and research into ECM fungal biology. Fruiting body production requires a living compatible tree host; that biological constraint is explained in full below.
Interested in this species? Out-Grow carries a liquid culture.
Laccaria CF prava Liquid CultureWhat Is Laccaria prava / Laccaria CF prava?
Laccaria prava is an ectomycorrhizal (ECM) basidiomycete — a gilled fungus that obtains nutrients not by decomposing dead matter, but by forming a living symbiotic partnership with tree roots. This places it in a fundamentally different ecological category from oyster mushrooms, shiitake, or any saprotrophic species. Understanding what ectomycorrhizal means is essential to understanding everything about how this organism grows, what it can and cannot do in culture, and why it is scientifically interesting.
In an ECM partnership, the fungal mycelium wraps around the fine feeder roots of compatible host trees, forming a sheath called the mantle, and penetrates between root cells to create the Hartig net — the interface through which nutrient exchange occurs. The fungus delivers nitrogen and phosphorus scavenged from soil to the tree; the tree delivers photosynthetically fixed carbon sugars to the fungus. Both benefit; neither is harmed. Without a living, compatible tree providing carbon, the fungus cannot produce fruiting bodies and does not complete its lifecycle.
Laccaria prava belongs to the genus Laccaria, a group of roughly 133 accepted species distributed on every continent except Antarctica. The genus is best known for the Deceiver mushrooms — small, variably colored agarics that shift dramatically in appearance depending on moisture content, earning the name from their habit of confounding identification. Laccaria laccata (the Common Deceiver) and Laccaria amethystina (the Amethyst Deceiver) are the most familiar members in Europe and North America. L. prava sits within the rapidly expanding documentation of Chinese subtropical diversity — 25 new Laccaria species from China have been described since 2000.
The genus Laccaria punches far above its public profile in terms of scientific importance. L. bicolor was the first gilled mushroom to have its complete genome sequenced, published in Nature in 2008. Research on L. bicolor revealed the molecular mechanisms by which ECM fungi suppress tree immune responses to establish mutualism, identified a new class of signaling molecules (lipochitooligosaccharides, or LCOs) shared with the oldest symbioses in evolutionary history, and established the genomic basis for the transition from free-living to symbiotic fungal lifestyles. Any Laccaria culture is access to this lineage.
How Is Laccaria prava (Laccaria CF prava) Classified?
| Kingdom | Fungi |
| Phylum | Basidiomycota |
| Class | Agaricomycetes |
| Order | Agaricales |
| Family | Hydnangiaceae Gäum. & C.W. Dodge (1928) — the Laccaria family |
| Genus | Laccaria Berk. & Broome (1883) |
| Species | Laccaria prava Fang Li (2020) |
| MycoBank ID | MB 832825 |
| Holotype | KUN-HKAS 106742, Kunming Institute of Botany Herbarium, China |
| Publication | Mycological Progress 19(5): 533 (2020) |
Laccaria prava was described as a new species directly in Laccaria with no basionym — it was not transferred from another genus. It has no documented synonyms. The species epithet prava derives from Latin meaning “crooked” or “distorted,” likely referring to a morphological feature of the stipe or basidiocarps in the type collection. The holotype is deposited at the Herbarium of Kunming Institute of Botany (KUN-HKAS 106742) in Kunming, Yunnan Province, China.
Family Hydnangiaceae is the accepted family placement for Laccaria across Index Fungorum, MycoBank, NCBI Taxonomy, and GBIF. Earlier placements in Tricholomataceae have been superseded by molecular phylogenetics. The family also includes the hypogeous (underground) genera Hydnangium and Podohydnangium — relatives that never produce surface fruiting bodies — suggesting the ECM lifestyle in Laccaria evolved from an ancestor that included both epigeous and hypogeous lineages.
How Do You Identify Laccaria prava (Laccaria CF prava)?
Laccaria prava shares the genus-level features of the Deceivers: small to medium agarics with waxy-looking, widely spaced gills, hygrophanous (moisture-sensitive) coloration, fibrous tough stipes, and white spore prints bearing echinulate (spine-ornamented) spores. The pileus is typically convex to plane or umbilicate (dimpled at center), with a finely striate margin when moist. Cap color shifts dramatically between moist and dry conditions — deep reddish-brown to pinkish-tan when wet, fading to buff or pale grayish when dry. This variability earned the genus its common English name.
The presence of rare pileocystidia (specialized cells on the cap surface) is noted as a distinguishing feature of L. prava per the original description (Li 2020). Full macroscopic and microscopic description data requires access to the original publication (Mycol. Progr. 19(5): 533, 2020). For species-level confirmation of the Out-Grow isolate, multi-locus sequencing (ITS + nrLSU + RPB2 + TEF1-α) against the holotype sequences deposited in GenBank would be required.
Laccaria laccata
Common Deceiver
Temperate Northern Hemisphere distribution. The most common Deceiver in Europe and North America. Typically found with pine, birch, beech, and oak. Larger than some other species; morphologically variable. Considered safe to eat but of poor culinary quality.
Key difference: temperate geography; multi-locus sequencing needed for confident separation
Laccaria amethystina
Amethyst Deceiver
Distinctly purple-violet gills and stipe when fresh — visually distinctive. The most reliably identified Deceiver by color alone. A documented arsenic hyperaccumulator; edible but arsenic content from contaminated soils is a genuine safety concern.
Key difference: vivid purple/violet coloration throughout
Laccaria bicolor
Two-Colored Deceiver
Distinguished by lilac-tinted basal mycelium (though this fades quickly). North American and European distribution. The reference genome species for the entire genus; used commercially as a forestry inoculant. Not typically confused with subtropical Asian collections.
Key difference: lilac basal mycelium; temperate distribution
Inocybe spp.
Fiber Caps
Small brown agarics superficially similar to pale Deceivers. Critical differences: brown spore print (vs. white in Laccaria), dextrinoid spores (react blue-black with Melzer’s reagent), and several species contain muscarine. White spore print eliminates Laccaria confusion immediately.
Key difference: brown spore print; always check spore print with LaccariaThe practical identification of any Laccaria species in the field requires attention to substrate (always near trees with ECM-compatible roots — never on dead wood or away from trees), spore print color (white), and the characteristic waxy, widely spaced gills. The hygrophanous color shift is a useful positive clue. Microscopic confirmation of echinulate (spine-bearing) spores definitively places a specimen in Laccaria. Species-level determination within the genus requires molecular data in most cases.
Where Does Laccaria prava (Laccaria CF prava) Grow?
Laccaria prava is known from subtropical broad-leaved forest in Guangdong Province, southern China, based on the 2020 type description. As a recently described species with a single peer-reviewed publication, its full geographic range has not been surveyed. Given the rapid pace of new Laccaria descriptions from China and Southeast Asia in recent years, its range likely extends beyond the type locality — but this has not been confirmed in print.
The habitat context is subtropical forest dominated by Fagaceae trees — the family that includes Quercus (oaks), Castanopsis, and Lithocarpus, all documented ECM hosts for Laccaria species. Pinaceae (Pinus) are also common ECM hosts in the region. Fruiting would be expected during the warm, humid monsoon season (late spring through autumn) consistent with rainfall-driven patterns for subtropical Chinese Laccaria.
The genus Laccaria as a whole is cosmopolitan — reported on every continent except Antarctica, associating with plants from over 20 genera across Abies, Castanea, Fagus, Pinus, Picea, Quercus, Larix, Lithocarpus, and others. L. bicolor alone is known from pine, fir, birch, and poplar. This broad host flexibility at the genus level suggests L. prava may have similar range capacity, but confirmed hosts for this specific species are not yet documented in accessible literature.
Can You Cultivate Laccaria prava (Laccaria CF prava)?
Laccaria prava is an obligate ectomycorrhizal fungus. Fruiting body production on any conventional substrate — grain, straw, sawdust, agar — is not possible. This is not a technical limitation that further optimization could overcome; it is a biological constraint. The fungus requires a living compatible tree host providing photosynthetically fixed carbon to produce fruiting bodies. No published protocol for growing any Laccaria species to fruiting bodies exists without a living tree.
What liquid culture of Laccaria CF prava can realistically achieve is a different and genuinely valuable question. The following table reflects the current evidence base.
| Application | Evidence Basis | Confidence |
|---|---|---|
| Mycelial biomass production in liquid culture for research or extraction | L. bicolor 2026 peer-reviewed data: 10.4 g/L dry weight on GYA under agitated conditions | HIGH |
| Tree seedling inoculation for ECM establishment | Extensively documented for L. bicolor; used commercially in forestry nurseries worldwide | HIGH |
| Agar plate culture for maintenance and strain expansion | Standard mycological practice; L. bicolor grows at 2.7 mm/day on PDA at ~24°C | HIGH |
| Experimental pot studies with compatible tree seedlings | L. parva and L. japonica pot experiments published; fruiting takes 1–3+ years | MODERATE |
| Fruiting body production on substrate without a living tree | No protocol exists; biological constraint, not technical limitation | NOT ACHIEVABLE |
Agar and Liquid Culture Conditions
No published agar or liquid culture data exists specifically for Laccaria prava. The following parameters are documented for closely related species and are the best available proxies. A landmark 2026 study (Belousov et al., Journal of Biotechnology 414: 1–7) published the first rigorous kinetic analysis of L. bicolor in axenic culture, providing the most current and directly applicable data for the genus.
The 2026 Belousov study found that agitation (shaking or stirring) is critical for biomass yield in liquid culture, producing substantially more mycelium than static conditions — attributed to improved oxygen supply and nutrient distribution. An important culture behavior to anticipate: L. bicolor alkalizes its culture medium over time, shifting from an initial pH of 5.5 to pH 8.0–9.0 at stationary phase. This pH shift is species-specific behavior and may affect contamination dynamics in longer cultures.
Growth rate in Laccaria is slow relative to saprotrophic competitors and contaminants. L. bicolor at 2.7 mm/day on PDA (versus the ~10–20 mm/day typical of saprotrophic species like Pleurotus or Trametes) means contamination management is a primary practical concern. Trichoderma species are documented antagonists of L. bicolor in co-culture; standard sterile technique and selective media (MMN rather than rich PDA or MEA) reduce this risk. Rhizobiaceae bacteria from ectomycorrhizosphere environments have been shown to enhance hyphal extension in related L. parva in controlled co-culture, suggesting bacterial community composition matters in cultivation settings.
The Tree Inoculation Pathway
For researchers, reforestation practitioners, or hobbyists willing to work with living tree seedlings, Laccaria CF prava liquid culture provides inoculant for the only pathway to fruiting bodies. The process is multi-stage and multi-year, but is documented and achievable.
Grow Liquid Inoculant
Expand the liquid culture in GYA or MMN medium under agitated conditions at 20–25°C. Homogenize mycelium to a suspension for application, or colonize vermiculite as a carrier substrate.
Select Compatible Host
Target Fagaceae (Quercus, Castanopsis, Lithocarpus) or Pinaceae (Pinus) seedlings based on L. prava’s Guangdong habitat. L. bicolor confirmed hosts include pine, fir, birch, and poplar.
Inoculate Root Zone
Apply inoculant to the root zone of seedlings at germination or transplant, using sterile or pasteurized potting substrate. Target low-nitrogen conditions (~2 mM NH&sub4;♠ based on L. japonica data).
Confirm ECM Establishment
ECM colonization typically visible in 4–12 weeks under greenhouse conditions. Confirm by staining root cross-sections for the Hartig net structure between root epidermal cells.
Manage Nitrogen Carefully
Elevated nitrogen suppresses mycorrhizal activity and sporocarp formation in many ECM species. Research on L. japonica found ~2 mM NH&sub4;♠ optimal for sporocarp production in pot experiments.
Wait — Years, Not Weeks
Timeline to fruiting bodies under field conditions is typically 1–3+ years after ECM establishment. Fruiting in controlled greenhouse conditions is rarely achieved for any Laccaria species and has not been documented for L. prava.
What Out-Grow’s Laccaria CF prava Liquid Culture Is For
Out-Grow’s Laccaria CF prava liquid culture is a mycelial suspension of a living subtropical Chinese ectomycorrhizal fungus in sterile nutrient medium. The primary applications are: mycelial biomass production in liquid GYA or MMN medium for research, teaching, or extraction work; expansion onto agar plates (MMN preferred) for culture maintenance and genetic study; and as inoculant for tree seedling colonization experiments with compatible Fagaceae or Pinaceae hosts.
This is not a fruiting mushroom culture. The ECM biology that makes this organism scientifically fascinating is also the biology that requires a living tree for sporocarp production. Anyone purchasing this culture for fruiting body production on a substrate bag will not succeed — not because of any quality issue, but because that is how ectomycorrhizal fungi work. The value of this culture is access to a living organism from a scientifically important lineage, for research, tree inoculation, and experimental mycology.
What Bioactive Compounds Does Laccaria prava (Laccaria CF prava) Contain?
No chemical analysis has been published for Laccaria prava specifically. The following describes what is documented for other Laccaria species and is presented as genus-level context, not as claims about L. prava.
Laccaria laccata fruiting bodies contain ergosterol and ergosterol peroxide as dominant sterols, with linoleic acid as the primary fatty acid — a profile broadly consistent with the wider Agaricales. The L. bicolor genome encodes a substantial complement of carbohydrate-active enzymes (CAZymes), and beta-glucan-type polysaccharides are likely present in Laccaria fruiting bodies by analogy with the broader Agaricales, but have not been isolated or bioassayed for this species.
No human clinical trials exist for any compound or extract from any Laccaria species. The genus has not entered functional mushroom markets and no supplements based on Laccaria extracts are commercially sold. L. bicolor’s relevance is primarily as a research organism in plant science and forestry, not pharmacology. The bioactivity research that exists for the genus is entirely in the context of plant symbiosis and ecology, not human medicine.
Is Laccaria prava (Laccaria CF prava) Safe to Eat?
Laccaria prava has essentially no documented human consumption history — the species was only described in 2020. The broader genus has a safe track record: L. laccata, L. proxima, L. amethystina, and L. bicolor are all regarded as non-toxic, with no known toxic alkaloids or poisoning mechanisms described for any Laccaria species. L. laccata is considered safely edible, if unremarkable in flavor, by experienced foragers across Europe and North America.
The absence of documented toxicity for L. prava reflects absence of study, not demonstrated safety. Without published chemical characterization, including arsenic speciation analysis, no confident assessment of edibility can be made for this species. Given the documented arsenic hyperaccumulation across the genus, arsenic profiling would be the most important first safety step before any consumption recommendation.
Standard laboratory and cultivation handling of Laccaria CF prava liquid culture or agar cultures presents no known safety concerns. Normal mycological hygiene is sufficient.
What Makes Laccaria prava (Laccaria CF prava) Remarkable?
MiSSP Effectors: Mutualism by Immune Suppression
L. bicolor secretes proteins called MiSSPs (Mycorrhiza-induced Small Secreted Proteins) directly into host plant root cells. MiSSP7, the best-characterized, stabilizes a plant protein (PtJAZ6) that suppresses jasmonic acid-induced immune responses — disabling the tree’s anti-pathogen defenses to allow ECM establishment. The identical molecular machinery used by pathogens is repurposed for mutualism. Loss of MiSSP7 production significantly reduces ECM colonization rates.
LCOs: Sharing Ancient Symbiosis Language
L. bicolor produces lipochitooligosaccharides (LCOs) — signaling molecules previously thought exclusive to nitrogen-fixing rhizobia bacteria and arbuscular mycorrhizal fungi. Nonsulfated LCOs enhance lateral root development in Populus via a CCaMK-dependent pathway that is part of the Common Symbiosis Pathway (CSP) shared with 450-million-year-old legume-rhizobia symbioses. ECM fungi independently evolved the same molecular language as far more ancient partnerships.
First Gilled Mushroom Sequenced
Laccaria bicolor S238N was the first gilled mushroom (order Agaricales) to have its complete genome sequenced, published in Nature in 2008. The 65 Mb genome revealed a suite of secreted effector proteins absent in non-symbiotic fungi, a reduced complement of plant cell wall-degrading enzymes (consistent with mutualism rather than pathogenesis), and an unusually high transposable element content hypothesized to enable rapid genomic adaptation during ECM establishment.
Arsenic Hyperaccumulation
Several Laccaria species accumulate arsenic at bioconcentration factors up to 29.1 relative to soil — concentrating the element to levels orders of magnitude above background. The dominant arsenic species are organoarsenic compounds (arsenobetaine, TMAO, DMA) rather than the more toxic inorganic forms, suggesting active methylation pathways are operating. The evolutionary reason for this accumulation is unknown; arsenic detoxification, competitive exclusion, or passive physicochemical trapping are all proposed but unconfirmed.
Intraspecific Strain Identity Matters More Than Richness
Research on L. bicolor in Douglas-fir plantations found that the identity of which strain is used influences host plant productivity more than the number of different strains applied. In other words, strain selection matters more than biodiversity of inoculum. This has direct practical implications for tree inoculation work with Laccaria CF prava: the specific isolate used could substantially influence outcomes.
The CF Designation as Transparency
Most commercial culture vendors apply species names to their isolates regardless of identification certainty. Out-Grow’s use of “CF” notation for this isolate accurately reflects that multi-locus molecular sequencing — the current gold standard for Laccaria species identification — has not confirmed species identity. In a genus where ITS alone demonstrably fails to resolve species boundaries, this honesty is genuinely unusual and scientifically appropriate.
Also available as a culture plate from Out-Grow.
Laccaria CF prava Culture PlateFrequently Asked Questions About Laccaria prava (Laccaria CF prava)
What does “Laccaria CF prava” mean?
“CF” stands for the Latin confer, meaning “compare with.” It is standard scientific notation indicating that an isolate has been tentatively compared to a named species but has not been formally confirmed at species level by multi-locus molecular analysis. The Out-Grow isolate resembles Laccaria prava but has not undergone the four-marker molecular sequencing (ITS + nrLSU + RPB2 + TEF1-α) that is now required for confirmed species descriptions in this genus. This is scientifically accurate labeling, not a product limitation — ITS barcoding alone is documented to be insufficient for species-level identification within Laccaria.
Can Laccaria CF prava produce fruiting bodies in cultivation?
No — not on any conventional cultivation substrate. Laccaria prava is an obligate ectomycorrhizal fungus. It requires a living compatible tree host providing photosynthetically fixed carbon to produce fruiting bodies. No published protocol exists for fruiting any Laccaria species without a living tree, and this is a biological constraint, not a technical limitation. What the liquid culture can produce is mycelial biomass in liquid or agar culture, and it can function as inoculant for tree seedling colonization experiments — the only pathway that could eventually lead to fruiting bodies, over a 1–3+ year timeline.
What is ectomycorrhizal and why does it matter for cultivation?
Ectomycorrhizal (ECM) fungi form obligate mutualistic partnerships with living tree roots. The fungal mycelium wraps around feeder roots and creates an exchange interface (the Hartig net) through which the fungus delivers nitrogen and phosphorus to the tree and receives carbon sugars in return. Because ECM fungi depend on tree-fixed carbon, they cannot sustain fruiting body production on substrate alone — the carbon source they need does not exist in grain bags or sawdust blocks. This places Laccaria, along with chanterelles, porcini, and truffles, in the category of fungi whose cultivation requires an entirely different approach from commercial mushroom production.
What trees should be used to inoculate with Laccaria CF prava?
Laccaria prava was described from subtropical Guangdong Province, China, where the dominant ECM-compatible trees are Fagaceae species (Quercus, Castanopsis, Lithocarpus) and Pinaceae (Pinus). These are the most likely compatible hosts. For reference, the most studied species L. bicolor associates successfully with pines, firs, birch, and poplar. The specific confirmed hosts for L. prava are not yet published in accessible literature, so some experimental flexibility in host selection is appropriate for inoculation trials.
Is Laccaria prava the same as the Deceiver mushroom?
Laccaria prava is a member of the genus Laccaria, which is commonly called the Deceivers. The most familiar species in this group in Europe and North America is Laccaria laccata (the Common Deceiver) — a small, variably colored agaric that shifts dramatically in appearance with moisture, making reliable identification difficult without spore examination. L. prava shares the genus’s characteristics (waxy widely spaced gills, white echinulate spores, hygrophanous cap, fibrous stipe) but is a distinct species described from subtropical China in 2020, not the temperate Deceiver familiar to European or North American foragers.
What is the significance of the Laccaria bicolor genome?
Laccaria bicolor was the first gilled mushroom (order Agaricales) to have its complete genome sequenced and published, in Nature in 2008. The genome revealed that ECM fungi encode a unique set of small secreted proteins (MiSSPs) with no equivalents in non-symbiotic fungi, reduced plant cell wall-degrading enzymes compared to decomposer fungi, and unusual transposon richness hypothesized to enable rapid genomic adaptation during symbiosis. It remains the reference genome for the entire Agaricales order and the primary molecular model for understanding how fungi establish partnerships with tree roots. Any Laccaria culture connects to this research lineage.