FungiHighest rank in taxonomy. Groups all life into domains: Animalia, Plantae, Fungi, etc.IUCN NEInternational Union for Conservation of Nature — the world authority on species extinction risk, using standardized criteria. — Not Evaluated — not yet assessed against the IUCN Red List criteria.In ProgressCurrent stage of this record in the editorial review workflow. Recent Sighting
Pleurotus ostreatus
Pearl Oyster Mushroom
(Jacq. ex Fr.) P. Kumm.
Detailed Texts Multi-lang
A widespread and popular edible wood-decay fungus. It features broad, fan or oyster-shaped caps ranging from 5 to 25 cm in diameter, shifting from dark gray to pale brown or cream. The mushrooms typically grow in tightly overlapping shelf-like clusters on dead wood; the gills are white, crowded, and run down a short, eccentric, or poorly developed stem (decurrent gills).
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Anonymous Curator
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Last modified by
Julia Trouin
TaxonomyBiological classification ranks placing this species within the tree of life, from Kingdom down to Genus.
PhylumRank below Kingdom. Groups organisms sharing a fundamental body plan (e.g., Chordata = vertebrates and some invertebrates).Basidiomycota
ClassRank below Phylum. Subdivides by structural traits (e.g., Mammalia, Aves, Reptilia, Insecta).Agaricomycetes
OrderRank below Class. Groups related families sharing common ancestry (e.g., Carnivora, Primates).Agaricales
FamilyRank below Order. Groups closely related genera (e.g., Felidae = cats, Canidae = dogs).Pleurotaceae
GenusRank just above Species. The first word in the two-part binomial scientific name.Pleurotus
Taxonomic AuthorityThe scientist who first formally described and published this species, followed by the year of publication.(Jacq. ex Fr.) P. Kumm.
Record Completeness
62%Coming soon
Ecology & StatusHow this species lives: habitat preferences, diet, behavior, population status, and role in its ecosystem.
OriginWhether the species is native (evolved here), endemic (found only here), or introduced by human activity.
Native
Population TrendDirection of change in population size over time: increasing, stable, decreasing, or unknown.
Stable
Trophic RolePosition in the food chain: producer, herbivore, carnivore, omnivore, decomposer, or parasite.
Decomposer
EdibilityWhether this mushroom is edible, toxic, hallucinogenic, or of unknown safety. Never eat based solely on this data.
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Cap ShapeShape of the mushroom cap (pileus): convex, flat, umbonate, funnel-shaped, bell-shaped, etc.
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Hymenium TypeThe spore-bearing surface of a fungus: gills, pores, teeth, ridges, smooth, or wrinkled.
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Fruiting SeasonTime of year when this species typically reproduces or flowers.
Year Round
Recent SightingsWhether this species has been observed in the wild in Costa Rica within recent years.
Yes
Habitat SummaryOverview of the specific ecosystems and environments where this species is found in Costa Rica. Multi-lang
Common throughout temperate and subtropical forests worldwide. It functions primarily as a saprotroph on dead, decaying hardwood logs and stumps (such as oak, beech, and birch), but can occasionally act as a facultative parasite on weakened living trees.SubstrateThe organic material or host organism this fungus colonizes and decomposes. Multi-lang
Information not available in English. Help us expand this record!BehaviourDaily activity patterns, movement, territory use, foraging style, and seasonal behavioral changes. Multi-lang
Operates as a highly aggressive wood-decomposing white-rot fungus. The mycelium invades fallen logs, systematically breaking down tough lignin and cellulose structures, converting rigid organic matter back into dynamic forest topsoil.Physical Measures
Length (cm)
5.0 - 25.0 cm
Hymenium StructuresMacro photographs of the spore-bearing surfaces used for mushroom identification.
No hymenium surface images available.
Evolutionary AdaptationsInherited traits and behaviors that improve the species' survival and reproduction in its specific environment. Multi-lang
Exhibits a unique carnivorous behavior: its mycelium secretes powerful nematicidal toxins to paralyze and kill microscopic soil nematodes, which are then digested by hyphae to supplement the nitrogen-poor wood diet.
Capable of mycoremediation; the fungus produces highly non-specific lignin-modifying enzymes (like laccases and peroxidases) that break down not only wood, but also toxic environmental pollutants, including hydrocarbons and plastics.
Main ThreatsDocumented pressures reducing the population: habitat loss, hunting, disease, climate change, and invasive species. Multi-lang
No risk of extinction. It is highly resilient, though extreme logging practices that clear dead wood biomass from forest floors can reduce wild populations locally.
Interesting FactsSurprising or notable facts that highlight what makes this species unique or ecologically important. Multi-lang
It is one of the easiest and most sustainable mushrooms to cultivate globally. It can thrive on diverse agricultural waste materials, including straw, coffee grounds, sawdust, and even shredded cardboard or denim.
The common name 'Oyster Mushroom' stems from the physical resemblance of the cap to a marine oyster shell, rather than its flavor profile, which is mild and slightly woody with a faint anise-like aroma.