| I. Hymenium free, mostly naked, or soon exposed | Hymenomycetes. |
| | Hymenium normally inferior— | |
| | | Fruit-bearing surface lamellose | Agaricini. |
| | | Fruit-bearing surface porous or tubular | Polyporei. |
| | | Fruit-bearing surface clothed with prickles | Hydnei. |
| | | Fruit-bearing surface even or rugose | Auricularini. |
| | Hymenium superior or encircling— | |
| | | Clavate, or branched, rarely lobed | Clavariei. |
| | | Lobed, convolute, or disc-like, gelatinous | Tremellini. |
| | | | | | |
| II. Hymenium enclosed in a peridium, ruptured when mature | Gasteromycetes. |
| | Hymenomycetous— | |
| | | Subterranean, naked or enclosed | Hypogæi. |
| | | Terrestrial, hymenium deliquescent | Phalloidei. |
| | | Peridium enclosing sporangia, containing spores | Nidulariacei. |
| | Coniospermous— | |
| | | Stipitate, hymenium convolute, drying into a dusty mass, enclosed in a volva | Podaxinei. |
| | | Cellular at first, hymenium drying up into a dusty mass of threads and spores | Trichogastres. |
| | | Gelatinous at first, peridium containing at length a dusty mass of threads and spores | Myxogastres. |
| | | | | | |
| III. Spores naked, mostly terminal, on inconspicuous threads, free or enclosed in a perithecium | Coniomycetes. |
| | Growing on dead or dying plants— | |
| | | Subcutaneous— | |
| | | | Perithecium more or less distinct | Sphæronemei. |
| | | | Perithecium obsolete or wanting | Melanconiei. |
| | | Superficial— | |
| | | | Fructifying surface naked. |
| | | | | Spores compound or tomiparous | Torulacei. |
| | Parasitic on living plants— | |
| | | Peridium distinctly cellular | Æcidiacei. |
| | | Peridium none— | |
| | | | Spores sub-globose, simple or deciduous | Cæomacei. |
| | | | Spores mostly oblong, usually septate | Pucciniæi. |
| | | | | | |
| IV. Spores naked, on conspicuous threads, rarely compacted, small | Hyphomycetes. |
| | Fertile threads compacted, sometimes cellular— | |
| | | Stem or stroma compound— | |
| | | | Spores dry, volatile | Isariacei. |
| | | | Mass of spores moist, diffluent | Stilbacei. |
| | Fertile threads, free or anastomosing— | |
| | | Fertile threads dark, carbonized— | |
| | | | Spores mostly compound | Dematiei. |
| | | Fertile threads not carbonized— | |
| | | | Very distinct— | |
| | | | | Spores mostly simple | Mucedines. |
| | | | Scarcely distinct from mycelium— |
| | | | | Spores profuse | Sepedoniei. |