Division I
Pileati.
Receptacle dilated, occasionally branched, having a tendency to an orbicular form. Hymenium inferior. Asci fixed. 2365. Agaricus. Hymenium in lamellæ. Lamellæ simple, parallel. * Stem central, with a veil. Gills unchangeable. Sporidia white. §1. Amanita. Veil double, universal separate, partial annular somewhat persistent. 2. Lepiota. Veil simple, universal, concrete, annular, somewhat persistent. Observations.
Tribe I. Hymenomycetes. This tribe is readily distinguished from the others by its hymenium containing sporules within the surface, and not naked from the Pyrenomycetes by the want of a perithecium and a reproductive nucleus from Gasteromycetes by the want of a peridium inclosing the sporules, which constitute the mass of the fungus, and from the Hyphomycetes and Coniomycetes by the sporidia not being exposed.