Order Hymenomycetes Tribe Pileati 

Agaricus adiposus Fr. 

Name—adeps, fat, stout, obese 

Series Dermini Subgenus Pholiota 

Botanical Characters. A. adiposus. Pileus convex obtuse, bright yellow, excessively viscid, covered with brown scales not persistent frequently fall off, 6–7 inches across; lamellae adnate, at first pale ochre, then somewhat ferruginous, not crowded; stipe covered with brown scales, 4–5 inches high, 1 inch thick in the large plants, sometimes stuffed again hollow, at first solid, at times more or less enlarged at the base, often regular; spores 0.00022 × 0.00032. ferruginous. Taste mild & pleasant. August & October. I found the above plant growing on a Morus alba tree in Carroll County, Maryland August 21st, 1880. In October I found it on a Morus alba tree in an adjacent street, in Baltimore. It is very beautiful & grows not only in the fork of the tree but aspires to the first branches.  

Baltimore, February 8th, 1881.