54 Journal of Mycology [Vol. IS 



DESCRIPTION OF GENERA AND SPECIES. 



I. PSATHYRELLA Fries, Epicrisis, 1836. 



Pileus membranaceous, conic or campanulate, thin and fra- 

 gile, hygrophanous, radiately striattilate. Stipe subcartilaginous, 

 fistulous, fragile. Lamellae adnexed or adnate, at length uni- 

 formly sooty-black ; spores elliptic, often large, black in mass. 



A genus in appearance wholly like Psathyra, but the species 

 separated out of it by the absence of any purplish tint in the 

 spores. 



§ I. FRAGILES. Siihcacspitose, growing on old zvood, 

 manure, etc. Stipe usually curved and Uexiious, the surface 

 often priiinose or furftiraceous. 



a. Lamellae broad, adfUJte. 



1. PSATHYRELLA MINIMA Peck, 41 N. Y. Rep. 1887. 

 Pileus membranaceous, hemispherical, obtuse, obscurely stri- 



atulate when moist, even and pruinose-atomate when dry, dingy- 

 yellow or reddish brown, becoming paler in drying. Stipe cap- 

 illary, white, pellucid, minutely mealy or furfuraceous. Lamellae 

 broad, adnate, at first white, becoming yellowish-cinnamon; 

 spores black, narrowly elliptic, 6-8 x 3-4 mic. 



Growing on excrement of deer in woods. New York, Peck. 

 Pileus 2-4 man. in diameter, stipe 8-12 mm. long. About the 

 size of and growing with Coprinus radiatus. 



2. PSATHYRELLA PALLESCENS, Agaricus palles- 



CENS SCHAEFFER, InDEX, 1774, A. DISSEMINATUS PeRSOON^ 

 COMM., 1800, A. TINTINABULUM BaTSCH, El. FuNG., I783. 



Pileus membranaceous, ovoid then campanulate, plicate- 

 sulcate, furfuraceous becoming naked, at first whitish or yellow- 

 ish, at length cinereous. Stipe subflexuous, fistulous, fragile, 

 white, furfuraceous then glabrous. Lamella,e broadly linear, ad- 

 nate, whitish-cinereous, blackening; spores subelliptic, 6-8 x 3-4 

 mic. 



Densely crowded together or caespitose, often growing in 

 multitudes around and upon old stumps and rotten wood. Found 

 everywhere in the world. Pileus 5-15 mm. in diameter, the stipe 

 2-3 cm. long, and 1-2 mm. thick. 



3. PSATPIYRELLA ODORATA Peck, 24 N.Y. Rep. 

 1871. 



Pileus thin, fragile, ovoid then convex and expanded, hygro- 

 phanous, chestnut colored and striatulate around the margin 

 when moist, clay-color with a pinkish tinge when dry, subatoma- 

 ceous and radiately wrinkled. Stipe fistulous, pallid, mealy and 

 striate at the summit, below subfibrillose and with a white my- 



