Stereum

It is the type genus of the Stereaceae family. Until recently, the genus was classified in the Corticiaceae family, of the Corticiales order. However, it was given its own family as a result of the split-up of the Corticiales.

The species can be divided into two groups: the bleeders (those that exude a red liquid from cut surfaces, similarly to Lactarius species) and the non-bleeders (those that do not). In 1959, Zdenek Pouzar created a distinct genus, Haematostereum, for the bleeding species of Stereum, including H. gausapatum, H. rugosum, and H. sanguinolentum.^[2] Modern authors do not consider Haematostereum to be a distinct genus, so it is currently treated as a synonym of Stereum.^[1]

There are numerous species in this genus, the most common one being Stereum hirsutum. The following species are recognised in the genus Stereum:^[4]

Stereum species are found to live on all kinds of deadwood or hardwood or dead leaves (they are therefore said to be saprobic). Sometimes they are also found on living leaves.