Shrimp of the Woods (Entoloma abortivum)
Shrimp of the Woods (Entoloma abortivum)
Shrimp of the Woods (Entoloma abortivum) is a wild edible mushroom found in eastern North American forests, known for two very different growth forms. It can produce normal gilled caps, but it also generates dense, white, shrimp-like lumps when its mycelium attacks honey mushrooms growing nearby. Those lumps — the result of one fungus parasitizing another — are what foragers prize.
Entoloma abortivum (Berk. & M.A. Curtis) Donk — Family Entolomataceae — Order Agaricales
Shrimp of the Woods (Entoloma abortivum) is one of the few wild mushrooms that owes its culinary appeal entirely to an act of biological aggression. When its mycelium encounters developing honey mushrooms (Armillaria spp.) in the forest floor, it invades and deforms them, producing dense, irregularly lobed white masses with a mild, vaguely seafood-like flavour and a firm, shrimp-like texture — hence the name. This carpophoroid form is the target of foragers across eastern North America and was long misunderstood: for decades, scientists assumed the honey mushroom was the aggressor. Modern transcriptomics reversed the verdict. The Shrimp of the Woods is the parasite. Its host is the one being consumed.
What Is Shrimp of the Woods (Entoloma abortivum)?
Shrimp of the Woods (Entoloma abortivum) belongs to the family Entolomataceae, a group of gilled mushrooms (agarics) characterised above all by their angular, salmon-pink spores — a feature visible under any decent microscope and unique to this family among common forest fungi. Most Entoloma species are either saprotrophic (living on dead organic matter) or mycorrhizal (forming partnerships with tree roots). A small subset are mycoparasitic — they attack other fungi for nutrition. Entoloma abortivum is the best-known and most visually dramatic example.
The species produces two recognisable growth forms. The first is a normal-looking gilled cap: smallish, dull grey-brown, salmon-pink spored, growing from forest litter near stumps and decaying wood in late summer. This form is structurally unremarkable and is difficult to distinguish from many other Entoloma species, some of which are dangerously toxic. The second form — the carpophoroid (literally: fruit-body-like structure) — is what gives Shrimp of the Woods (Entoloma abortivum) its identity. These are the irregular, dense white lumps that form when E. abortivum mycelium colonises and deforms developing honey mushroom fruit bodies before they can fully form. The result looks nothing like a mushroom. It looks like a lump of popcorn, or, to foragers, a cluster of shrimp.
The ecological relationship between Shrimp of the Woods (Entoloma abortivum) and honey mushrooms is not incidental or accidental — it is the defining feature of the species' life history. Without Armillaria present, the characteristic carpophoroid form does not appear. This means finding Shrimp of the Woods in the field is partly a matter of knowing where honey mushrooms grow and timing your visit to their fruiting season.
Honey mushrooms (Armillaria species) are themselves significant tree root pathogens — agents of Armillaria root rot, one of the most widespread fungal diseases in temperate forests worldwide. Shrimp of the Woods (Entoloma abortivum) therefore sits at a three-way intersection in forest ecology: a wild edible that parasitises a plant pathogen, which itself parasitises living trees. The subterranean trophic tangle it inhabits is one of the more fascinating in temperate mycology.
How Is Shrimp of the Woods (Entoloma abortivum) Classified?
| Full Classification | |
|---|---|
| Kingdom | Fungi |
| Phylum | Basidiomycota |
| Class | Agaricomycetes |
| Order | Agaricales |
| Family | Entolomataceae |
| Genus | Entoloma (Fr. ex Rabenh.) P. Kumm. |
| Species | Entoloma abortivum (Berk. & M.A. Curtis) Donk |
| Basionym | Clitopilus abortivus Berk. & M.A. Curtis |
| MycoBank ID | MB297232 |
Naming History and Synonyms
Shrimp of the Woods (Entoloma abortivum) was first described by the American botanist-mycologists Miles Joseph Berkeley and Moses Ashley Curtis in the 19th century, placed initially in the genus Clitopilus — a grouping of white-spored, typically funnel-shaped or decurrent-gilled fungi. The basionym Clitopilus abortivus Berk. & M.A. Curtis reflects this original placement. The species was later moved to Rhodophyllus abortivus (Berk. & M.A. Curtis) Singer under the older generic concept that grouped pink-spored agarics, before landing in Entoloma when the Dutch mycologist Marinus Anton Donk made the combination in 1949.
A live database discrepancy is worth noting: MycoBank still cross-references the species under Clitopilus abortivus while also carrying the MB297232 entry for Entoloma abortivum. Index Fungorum, NCBI taxonomy, and GBIF all place the species in Entoloma within Entolomataceae, and this is the treatment followed in all modern floras and the transcriptomic literature. The Clitopilus attribution on MycoBank has been flagged by field mycologists as a source of confusion but does not reflect current scientific consensus.
The ITS Reference Sequence
A key molecular reference for Shrimp of the Woods (Entoloma abortivum) is ITS accession GQ289150, from a Canadian collection by H. den Bakker, used as an anchor in Nordic Entolomataceae phylogenies. The 2021 transcriptomics study extracted nine ITS sequence variants from a single carpophoroid transcriptome — all clustering as E. abortivum — reflecting intragenomic variation within the ribosomal repeat unit rather than species-level diversity. No failure of ITS to distinguish E. abortivum from congeners has been demonstrated, though in the genus Entoloma broadly, ITS has limited resolving power among closely related species complexes. Additional markers (LSU, RPB2, tef1) are used for robust species-level placement in the family.
A de novo transcriptome assembly for Shrimp of the Woods (Entoloma abortivum) was published in 2021 — approximately 120 Mb in size, with 43,599 contigs and 94.5% BUSCO completeness (a standard metric for measuring how complete a genomic dataset is, using benchmarked universal single-copy genes). This resource provides a near-complete reference for the species' coding genes even in the absence of a formally annotated genome.
How Do You Identify Shrimp of the Woods (Entoloma abortivum)?
Shrimp of the Woods (Entoloma abortivum) produces two morphologically distinct forms that require different identification strategies. The carpophoroid form is distinctive and relatively safe to identify with confidence; the gilled cap form is ambiguous and should not be eaten. Understanding this distinction is the most important safety point for any forager approaching this species.
The Carpophoroid Form (the "Shrimp")
The Gilled Cap Form (Normal E. abortivum)
Microscopic Features
Under the microscope, Shrimp of the Woods (Entoloma abortivum) shows the angular (polyhedral) spores characteristic of the entire genus. Spores measure approximately 7–10 × 6–8 µm, typically with 5–6 angles; the Q ratio (length divided by width) is close to 1.3–1.5 given the near-equidimensional but distinctly angular outline. Basidia are tetrasporic (bearing four spores each), as is standard for Entoloma. Hymenial cystidia (sterile cells in the spore-bearing layer) are not especially diagnostic for this species; identification at the microscopic level relies primarily on spore shape and size. The hyphal system is monomitic (a single type of generative hyphae), with clamp connections common in the genus, though published detail specifically for E. abortivum is sparse in field-oriented sources.
Lookalike Species
Ecologically associated and often fruiting in the same clusters. Normal honey mushrooms have brownish caps, whitish gills, a ring on the stem, and produce white spore prints — compared to the salmon-pink of E. abortivum. The carpophoroid masses occur precisely because these two fungi are sharing space; both may be present simultaneously. Honey mushrooms are edible when well-cooked but can cause reactions when undercooked or consumed in large quantities.
This is the critical risk. The gilled cap form of Shrimp of the Woods (Entoloma abortivum) resembles many other grey-brown Entoloma species, including Entoloma sinuatum and related taxa that cause gastrointestinal poisoning or more serious syndromes. Extension services explicitly advise: only the aborted carpophoroid form should be eaten; the gilled caps should be left alone because reliable macroscopic separation from toxic congeners is not possible without expert knowledge.
The carpophoroid form has few close lookalikes in context — the combination of white, dense, irregular lobed masses growing alongside honey mushrooms and normal Entoloma caps is fairly distinctive. However, any unfamiliar white mass on forest ground should be approached cautiously and confirmed with multiple features before consumption.
Where Does Shrimp of the Woods (Entoloma abortivum) Grow?
Shrimp of the Woods (Entoloma abortivum) is a mycoparasite — meaning it is a fungus that feeds on another fungus. Specifically, it is a necrotrophic mycoparasite of honey mushrooms (Armillaria species), attacking their developing fruit bodies, killing the host tissue in the process, and incorporating it into the distinctive carpophoroid masses. Necrotrophic (from the Greek nekros, dead, and trophe, feeding) means the parasite kills its host and then continues feeding on the dead tissue — in contrast to biotrophic parasites that keep the host alive while feeding.
This trophic mode has a direct practical implication: Shrimp of the Woods (Entoloma abortivum) cannot be found, and almost certainly cannot produce its characteristic carpophoroid form, without a fruiting Armillaria population nearby. It tracks its host. Where honey mushrooms are common, this species can be abundant. Where they are absent, it will not appear regardless of other soil or habitat conditions.
Substrate and Microhabitat
Both the gilled caps and the carpophoroids appear on forest floor litter, humus, and decaying wood near stumps and buried roots where Armillaria is active. The species does not fruit directly on live standing trees; it appears on the forest floor in the zone of decaying roots and woody debris where honey mushroom mycelium is already established. Carpophoroids typically cluster around the base of trees or on buried wood where honey mushrooms are also fruiting in late summer and autumn.
Geographic Range
Shrimp of the Woods (Entoloma abortivum) is described as common in eastern North America, particularly east of the Rocky Mountains, in temperate mixed and deciduous forests where Armillaria is abundant. Herbarium records and phylogenetic collections include material from Canada and the United States. The transcriptomic study's Armillaria host was identified as conspecific with eastern North American A. mellea, placing the best-documented populations in this region. Whether the species occurs in Europe or Asia at comparable abundance is not well established in the published literature, though its Armillaria host genus is globally distributed.
Seasonality and Fruiting
Fruiting of Shrimp of the Woods (Entoloma abortivum) is tied to honey mushroom fruiting, which in eastern North America falls typically from mid-late summer into autumn. Foraging guides place it in mid- to late fall, though exact timing varies by elevation, latitude, and local conditions. The carpophoroid masses are the primary foraging target; in good years, they can be abundant in suitable oak-hickory or mixed hardwood forests with heavy Armillaria activity.
Ecological Role
By attacking and deforming honey mushroom fruit bodies, Shrimp of the Woods (Entoloma abortivum) may reduce Armillaria spore production in some populations — though the ecological magnitude of this effect has not been quantified. Armillaria species are significant root pathogens of both hardwood and conifer trees, causing root and butt rot across temperate forests worldwide. The possibility that E. abortivum acts as a natural check on a tree pathogen adds an interesting ecological dimension to what is, from the forager's perspective, simply a delicious wild edible. No IUCN conservation assessment exists for this species; it is considered common in its core eastern North American range.
Can You Cultivate Shrimp of the Woods (Entoloma abortivum)?
Cultivating the characteristic carpophoroid form of Shrimp of the Woods (Entoloma abortivum) independently — on blocks, grain, or standard mushroom substrates — has not been achieved in any published, peer-reviewed study. What exists in the literature is a body of co-culture and transcriptomic work that explains precisely why this is so difficult, alongside some basic agar culture data. This section distinguishes carefully between what is documented and what remains speculative.
Why the Carpophoroid Form Cannot Be Cultivated in Isolation
The fundamental obstacle is biological: the distinctive shrimp-like masses are not a growth form that Entoloma abortivum produces on its own. They are a host-dependent mycoparasitic phenotype — a structure that only forms when E. abortivum mycelium interacts with developing Armillaria fruit bodies at the right developmental stage. On its own substrate, without an Armillaria host actively fruiting, there is no evidence that E. abortivum produces anything resembling the carpophoroid form.
To replicate the carpophoroid stage in cultivation, you would theoretically need to establish a fruiting Armillaria culture on suitable wood or artificial substrate, introduce E. abortivum mycelium at the right developmental window to colonise forming Armillaria primordia (the early-stage precursors to mushroom fruit bodies), and maintain environmental conditions that simultaneously support both fungi. This three-step requirement has never been systematically optimised in published work.
What the Experimental Literature Shows
Classic Co-culture Study
E. abortivum was grown on 2% malt agar at 24°C in the dark. Agar plugs were then used to inoculate developing Armillaria tabescens fruit bodies. The result: honey mushrooms aborted, confirming the mycoparasitic interaction. This is the clearest laboratory demonstration that E. abortivum causes aborting — and that it requires a living, developing host.
SOJ Agar Inhibition
Co-culture assays on SOJ agar (a selective medium) showed that E. abortivum colonies severely inhibited Armillaria growth, corroborating its ability to produce inhibitory compounds in vitro. This also confirms robust colony expansion on agar — the species can be maintained in culture.
2024 Preprint: Liquid Media
A 2024 preprint on fruiting body heterogeneity and haustorium-like structures (invasion structures used by parasites to penetrate host cells) in the Armillaria–E. abortivum interaction refers to liquid media cultures in experimental systems, confirming both fungi can be grown in submerged culture. Full cultivation parameters are not detailed in the available abstract.
Transcriptomics (2021)
Gene expression during carpophoroid formation shows upregulation of lectins, chitinases, ABC transporters, and oxalate decarboxylase — a molecular toolkit for parasitising Armillaria. These genes are activated in the presence of the host; their role in standalone growth is not established. The transcriptome itself was assembled from field-collected carpophoroids, not from cultivated material.
Agar Culture Behaviour
The peer-reviewed baseline for agar culture of Shrimp of the Woods (Entoloma abortivum) is modest but solid. The classic co-culture study established that the species grows on 2% malt extract agar (MEA) at 24°C in the dark. The pH of standard MEA is approximately 5.5–6.0, and growth was sufficient for co-culture experiments, but no quantitative growth rate (mm/day or mm/week) has been published. Colony morphology — colour, texture, edge characteristics — is not described in accessible summaries; laboratory photographs in the original PDFs would be needed for precise notes.
By analogy with other Entoloma species and related Agaricales saprotrophs, PDA (potato dextrose agar) and similar nutrient-rich media would likely also support growth, but this has not been confirmed specifically for E. abortivum. Optimal temperature across a gradient, precise pH optima, and colony characteristics on different media all remain open research questions.
Liquid Culture
Liquid culture of Shrimp of the Woods (Entoloma abortivum) is biologically feasible — the 2024 preprint reference confirms both fungi in the interaction can be grown in submerged culture — but no dedicated study has characterised it. There are no published data on medium composition, shaking speed, pellet versus dispersed-hyphal growth morphology, biomass yields, oxygen demand, or storage stability of liquid mycelium from this species.
Realistic uses for a liquid culture of E. abortivum, based on the experimental literature rather than vendor claims, include: inoculation of agar plates for co-culture experiments with Armillaria; mycelial biomass production for molecular biology (RNA extraction, gene expression studies, proteomic screening); and potential spawn production for experimental Armillaria co-fruiting setups where liquid culture inoculum is introduced to Armillaria-colonised substrates. There is no peer-reviewed evidence that liquid culture inoculum alone will produce either typical E. abortivum caps or carpophoroids on standard mushroom blocks without an Armillaria host.
No Production Metrics Exist
There are no peer-reviewed reports of biological efficiency percentage, standard flush counts, yield per kilogram of substrate, or strain-level comparisons for productive versus unproductive isolates of Shrimp of the Woods (Entoloma abortivum). Any such figures circulating in hobbyist or vendor contexts are extrapolated or anecdotal.
What Bioactive Compounds Does Shrimp of the Woods (Entoloma abortivum) Contain?
The chemistry of Shrimp of the Woods (Entoloma abortivum) is almost entirely unstudied from the perspective of small molecules, metabolites, and bioactivity. The accessible scientific literature covers this species in ecological, morphological, and transcriptomic terms — the chemistry of the fruiting body and mycelium has not been the subject of any dedicated analytical study.
Not characterised for E. abortivum. Common in Agaricales broadly, but no species-specific extraction, characterisation, or bioassay data exist.
Not identified. No GC–MS, LC–MS, or NMR-based characterisation of terpenoids from this species appears in accessible literature.
Not characterised. No DPPH (free-radical scavenging), FRAP (ferric-reducing antioxidant power), or GAE (gallic acid equivalent antioxidant) data exist for E. abortivum extracts.
Despite the notable "shrimp-like" flavour noted by foragers, no GC–MS or GC-olfactometry study has identified the volatile compounds responsible. The flavour chemistry of this species is an open research question.
The 2021 transcriptome identified gene families expanded in E. abortivum relative to non-parasitic Entoloma: β-trefoil-type lectins, oxalate decarboxylase, chitinases, and ABC transporters. These are functional gene predictions, not characterised chemical compounds — concentrations and activities in vivo have not been measured.
No minimum inhibitory concentration, IC₅₀, or other quantitative bioassay data from E. abortivum extracts appear in accessible literature. Any health or antimicrobial claims are unsupported.
Is Shrimp of the Woods (Entoloma abortivum) Safe to Eat?
The carpophoroid form of Shrimp of the Woods (Entoloma abortivum) — the distinctive white lumps that form when it parasitises honey mushrooms — has a track record of safe use in foraging communities across eastern North America and is listed as edible in reputable mycological sources. No specific toxins have been characterised from it, and no well-documented case reports of poisoning from correctly identified carpophoroids are recorded in the toxicological literature. This is meaningful: the species has been consumed by foragers for a long time, which provides some real-world safety signal.
However, the edibility picture for the full species is deliberately more cautious than for the carpophoroid form alone. Michigan State University Extension's safety guidance makes an important distinction: both the aborted and non-aborted forms have been referred to as E. abortivum, but only the aborted carpophoroid form is considered edible. The gilled cap form should not be eaten because it cannot be reliably distinguished from poisonous Entoloma congeners without expert knowledge — and many Entoloma species cause gastrointestinal poisoning or more serious syndromes.
The Genus Risk
Entoloma as a genus contains a significant number of toxic species. Entoloma sinuatum and related taxa are among the more common causes of gastrointestinal mushroom poisoning in temperate regions, producing nausea, vomiting, and cramps within hours of consumption. The salmon-pink spore print of all Entoloma species is a useful field feature, but it does not render a species safe — it merely confirms genus placement. Within a genus that includes many toxic members, species-level identification matters greatly, and the gilled form of Shrimp of the Woods (Entoloma abortivum) sits in a cluster of dull grey-brown species that are macroscopically similar to dangerous congeners.
Safety Profile Summary
No drug interactions, medication contraindications, or chronic exposure effects are documented for Shrimp of the Woods (Entoloma abortivum). Safe handling follows general wild mushroom practice: correct identification (restrict to carpophoroid form only), thorough cooking, avoidance of large quantities on first consumption, and particular caution in individuals with known mushroom sensitivities or allergies. No formal toxicological clearance exists — the edible status rests on field tradition and the absence of documented adverse events from correctly identified material, not on clinical testing.
What Makes Shrimp of the Woods (Entoloma abortivum) Remarkable?
Shrimp of the Woods (Entoloma abortivum) sits at the intersection of several unusual biological phenomena — ecological, evolutionary, and molecular. Its remarkable features are not simply curiosities: they connect to active scientific questions about how fungi evolve parasitic lifestyles and how forest pathosystems are structured.
A Basidiomycete That Parasitises a Basidiomycete
Mycoparasitism — one fungus attacking another — is well-known in Ascomycetes (most famously Trichoderma species attacking other moulds). It is far rarer among Basidiomycetes, the group containing most familiar mushrooms. Shrimp of the Woods (Entoloma abortivum) and its close relative Entoloma parasiticum are among the very few agaric (gilled mushroom) species documented as mycoparasites on other macrofungi. The cross-basidiomycete parasitism leading to visible, edible carpophoroids is essentially unique.
The Science Was Backwards for 100+ Years
From early observations through much of the 20th century, the carpophoroid masses were interpreted as honey mushrooms parasitising Entoloma. The host-parasite relationship seemed intuitively obvious from the morphology: Armillaria is a notorious pathogen; Entoloma is not. A 2010 molecular study and a 2021 transcriptomic analysis reversed this completely, showing gene expression, inhibitory co-culture data, and genomic signatures all consistent with E. abortivum as the aggressor. This reversal is a model case of how morphological inference can fail and how transcriptomics can resolve it.
Genomic Streamlining for Parasitism
The transcriptome of Shrimp of the Woods (Entoloma abortivum) shows expanded gene families with clear relevance to mycoparasitism: β-trefoil-type lectins (proteins that bind carbohydrates, potentially targeting Armillaria cell walls), chitinases (enzymes that degrade chitin, the structural polymer of fungal walls), and oxalate decarboxylase (which processes oxalate, a compound relevant to fungal cell wall chemistry). The pattern suggests evolutionary specialisation for this parasitic lifestyle — retained toolkit, directed at a specific host.
Embedded in a Three-Way Forest Pathosystem
Shrimp of the Woods (Entoloma abortivum) is a mycoparasite of honey mushrooms, which are themselves plant pathogens causing Armillaria root rot — one of the most economically significant fungal diseases in temperate forests. This places E. abortivum at a third trophic level in the same disease system: trees are harmed by Armillaria, and Armillaria is attacked by E. abortivum. Whether this three-way interaction has measurable effects on tree health or forest disease dynamics remains unexplored.
An Edible That Requires Its Host to Be Present
From the forager's perspective, Shrimp of the Woods (Entoloma abortivum) is unusual because you are really hunting for honey mushrooms — and finding this species as a byproduct. The two fruiting simultaneously in the same location, one normal and one transformed into something edible and distinctive, makes for an unusual foraging experience that no other common North American species quite replicates.
Chemistry Entirely Unknown
Despite being a foraged edible with a distinctive flavour profile — the "shrimp" taste that gives the species its common name — the volatile compounds responsible for that flavour have never been analytically identified. No GC–MS study of E. abortivum exists. The flavour that defines its culinary identity remains, chemically, a mystery. This is unusual for a species with meaningful foraging appeal.
Frequently Asked Questions About Shrimp of the Woods (Entoloma abortivum)
What is Shrimp of the Woods (Entoloma abortivum)?
Shrimp of the Woods (Entoloma abortivum) is a wild mushroom native to eastern North American temperate forests. It is a mycoparasite of honey mushrooms (Armillaria spp.) — meaning its mycelium invades and feeds on developing honey mushroom fruit bodies, producing distinctive dense white lumps known as carpophoroids. These lumps, which have a mild seafood-like flavour and firm texture, are the edible form foraged across eastern North America in late summer and autumn.
Is Shrimp of the Woods safe to eat?
The carpophoroid (aborted, shrimp-like) form of Shrimp of the Woods (Entoloma abortivum) is considered edible with a track record of safe use in foraging communities. No toxins have been isolated from it and no case reports of poisoning from correctly identified carpophoroids are documented. However, the gilled cap form should not be eaten — it cannot be reliably distinguished from toxic Entoloma species without expert knowledge, and many Entoloma species cause gastrointestinal poisoning. Restrict collection to the distinctive white carpophoroid lumps only.
Why does Shrimp of the Woods only grow near honey mushrooms?
Because Shrimp of the Woods (Entoloma abortivum) is a mycoparasite of honey mushrooms. Its mycelium requires developing Armillaria fruit bodies to produce the characteristic carpophoroid form — those structures are produced when E. abortivum invades and deforms honey mushroom primordia. Without an actively fruiting Armillaria host present, the carpophoroid form does not appear. Finding Shrimp of the Woods in the field is partly a matter of locating active honey mushroom populations.
Can Shrimp of the Woods (Entoloma abortivum) be cultivated?
Not in any documented, reproducible way. No peer-reviewed study has produced carpophoroids or normal fruit bodies independently on artificial substrate. The carpophoroid form is a host-dependent mycoparasitic phenotype — it only forms when E. abortivum interacts with developing Armillaria fruit bodies. The species can be grown on 2% malt agar at 24°C in the dark and can inhibit Armillaria in co-culture, but producing the edible fruiting form in isolation has not been achieved or published.
Does Entoloma abortivum really parasitise honey mushrooms, or is it the other way around?
Modern molecular and transcriptomic evidence is clear: Shrimp of the Woods (Entoloma abortivum) is the parasite; honey mushrooms (Armillaria spp.) are the host being consumed. For most of mycological history, the reverse was assumed — that Armillaria was attacking and deforming Entoloma. A 2010 study and a 2021 transcriptomics analysis showed that gene expression in the carpophoroid stage is consistent with E. abortivum acting as a necrotrophic mycoparasite on Armillaria, not the other way around.
How do I tell Shrimp of the Woods apart from honey mushrooms in the field?
The carpophoroid form of Shrimp of the Woods (Entoloma abortivum) is visually very different from honey mushrooms: it is an irregular, dense, white to off-white lobed mass with no cap, gills, or stem structure — more like a lump of popcorn or a cluster of shrimp than a recognisable mushroom. Honey mushrooms (Armillaria spp.) have brownish caps, white gills, often a ring on the stem, and a white spore print. The two typically grow together; the presence of both forms — white carpophoroid lumps alongside normal honey mushrooms — in the same location is itself a strong identification cue for Shrimp of the Woods.