Summary:
Features include flat annual growth on conifer wood, soft cottony consistency, small pores that are angular and white to cream, margin white and wide, sometimes with rhizomorphs, and microscopic characters. The name Antrodia gossypina is used commonly but is incorrect. The basionym was Poria gossypium Speg., using the noun ''gossypium'' - ''cotton''. Because this epithet is a noun, it does not change its gender to agree with the genus. Thus Fibroporia gossypia (as used by Parmasto) is not a correct combination. The adjective ''gossypina'' would be a permissible species epithet meaning ''pertaining to cotton'' or ''cottony'', an adjective which would agree with the gender of the genus. But that was not the name originally applied to the species by Spegazzini. (Dai(2)). The description derived from Gilbertson(1).

Taste:
not distinct

Microscopic:
spores 4.5-6 x 2.5 microns, elliptic, IKI-, thin-walled, often with small oily inclusions; basidia 4-spored, 15-20 x 4-5 microns, clavate; cystidia or other sterile elements absent; hyphal system dimitic, generative hyphae 3-6 microns wide, thin-walled, clamped, predominant in trama, skeletal hyphae scattered in trama, more common in context, 3-5 microns wide, straight, thick-walled to solid, inamyloid, colorless

Spore Deposit:
white (Buczacki)

Notes:
Antrodia gossypium is known in BC from three collections, (Ginns), and has been found in ON, AZ, CO, NY, PA, (Gilbertson).