Inocybaceae

Inocybaceae is a family of fungi in the order Agaricales. It comprises predominantly small to medium-sized brown mushrooms that form ectomycorrhizal associations with trees. The type genus is Inocybe, and other genera commonly included in the family are Inosperma and Pseudosperma. In recent decades, molecular studies have led to taxonomic revisions that have moved some species formerly placed in Inocybe into these segregate genera.

Morphology in inocybaceous species typically features dry, fibrous or finely scaled caps that range from pale to dark brown. Gills are usually crowded and attach to a slender, often fibrous stipe. Flesh is generally pale, and the odor is often mild. The spore print is brown, and the basidiospores are commonly ellipsoid to ovoid and smooth.

Ecology and distribution: Members are predominantly ectomycorrhizal, forming mutualisms with a variety of trees including conifers and hardwoods. They are distributed worldwide, with the greatest diversity in temperate forests and boreal regions. Fruiting bodies commonly appear in late summer to autumn after rainfall.

Toxicology and edibility: A substantial number of species in Inocybaceae contain muscarine, a toxin that can cause salivation, lacrimation, sweating, and abdominal cramps. Because many species resemble edible look-alikes and identifications can be challenging, they are generally regarded as inedible or of unknown edibility, and accidental poisonings have been reported.

Taxonomy and diversity: The family comprises dozens of species across several genera, with ongoing revisions as molecular data clarify evolutionary relationships within Inocybaceae.