OMPHALIA. 383 



Agaricus chioneus, Persoon, Myc. Eur., iii. t. 26, f. 10-11 ; 

 Cke., Hdbk., p. Ill ; Cke., Illustr., pi. 21 2D. 



On wood, dung, leaves, &c. 



Somewhat resembling P. septicus, Irat smaller, with a less 

 distinct stem, the flesh of the pileus much thinner. Known 

 from P. hypnophilus by the distinctly villose or downy pileus. 



Pileus 2 lines broad, extremely delicate and fragile, 

 clothed with white down, fixed by a few downy threads, the 

 margin involute. Gills radiating, distant, with sometimes a 



,gle smaller one in the interstices. (Berk.) 



sin 



OMPHALIA. Fries, (figs. 10, 11, p. 301.) 



Pileus symmetrical, usually very thin, depressed or infun- 

 dibuliform; gills truly decurrent; stem distinctly cartila- 

 ginous externally, tubular, but the cavity frequently stuffed, 

 especially when young, usually expanding upwards into the 

 flesh of the pileus ; spores more or less elliptical, smooth. 



Ompfialia, Fries, Syst. Myc., i. p. 162; Cke., Hdbk., p. 91. 



Agreeing with Clitocybe in the decurrent gills, but readily 

 known by the externally polished, cartilaginous stem, and 

 the very thin substance of the pileus. Separated from 

 Mycena and Collybia by the truly decurrent gills. 



The species are with few exceptions small, and many grow 

 on wood, twigs, &c.'; none are edible. Smell obsolete, or 

 nearly so, in all the species. 



ANALYSIS OF THE SPECIES. 



I. COLLYBIARII. 



Pileus dilated from the first, margin incurved. 



* Hydrogrammi. Usually large, gills narrow, very much 

 crowded. 



(In addition to the stem character, tho species of this 

 group differ from the Cyathiformes section of Clitocybe, in the 

 gills being truly decurrent from the first, very much crowded, 

 and arcuate.) 



