All the known species belong to the Oomycetes, the Pyrenomycetes, the Hymenomycetes or the Gasteromycetes.
Thus, many Hymenomycetes (Agarics, Pulyporei, &c.) live on the wood of trees.
30; Wager, On Nuclear Division in the Hymenomycetes, Ann.
The group may be divided into two main divisions, Hymenomycetes and Gasteromycetes.
Hymenomycetes are a very large group containing over 11,000 species, most of which live in soil rich in humus or on fallen wood or stems, a few only being parasites.