Murrill : Dark-Spored Agarics 



275 



. Pileus campanulate to expanded, 1-2.5 cm - broad ; surface deeply 

 radiate-sulcate, grayish-black, light-yellow on the umbo, pellucid ; 

 lamellae adnexed,- subventricose, cinereous, black on the edges; 

 spores ovoid-apiculate, purplish-brown, 8-10 x 5-6 /x; stipe slender, 

 hollow, shining, white above, red below, 4-6 cm. long, 1-2 mm. 

 thick. 



Type locality : Lincoln, Nebraska. 

 Habitat : On the ground. 



Distribution : Known only from the type locality. 

 The type specimens were collected by Clements. I have not 

 seen them. 



12. Psathyrella angusticeps Peck, Bull. Torrey Club 33: 217. 



1906 



Pileus very thin, membranaceous, conic or subcampanulate, sub- 

 acute, often with a small but prominent umbo, gregarious, 1-2 cm. 

 broad ; surface hygrophanous, fragile, minutely flocculose, appen- 

 diculate with minute fragments of the whitish veil, sometimes 

 striate on the margin, grayish-brown, whitish or grayish on the 

 margin; lamellae ascending, thin, brittle, moderately crowded, ad- 

 nate, pale-olive-green becoming darker and finally black ; spores 

 broadly-ellipsoid, black, abruptly-narrowed at the ends, 15-20 x 

 10-12^; stipe very long, slender, fibrous, rather tough, hollow, 

 straight or nearly so, ashy-gray above, chestnut-colored below, 

 sometimes slightly thicker toward the base, 5-9 cm. long, about 

 1 mm. thick. 



Type locality : Falmouth, Massachusetts. 

 Habitat : On grassy ground. 



Distribution : Known only from the type locality. 



The type specimens, which are well preserved at Albany, were 

 collected by Simon Davis on June 22, 1905. They resemble a 

 narrow, unexpanded form of Panaeolus campanulatus. 



13. Psathyrella atomata (Fries) Quel. Champ. Jura Vosg. 



123. 1872 



Agaricus atomatus Fries, Syst. Myc. 1 : 298. 1821. 



Pileus bell-shaped, obtuse, solitary or gregarious, 1-2.5 cm - 

 broad ; surface atomaceous, hygrophanous, livid, tan or pale-flesh- 

 colored when dry; margin slightly striate, dry, even or wrinkled; 

 lamellae adnate, subdistant, broad, ventricose, whitish to blackish; 

 spores ovoid to ellipsoid, 13-15 x 6-8//,; stipe equal, lax, slightly 



