Murrill : Dark-Spored Agarics 



273 



hygrophanous, glabrous, sometimes having fragments of the white 

 veil when very young, chestnut to tan, margin even, splitting ; con- 

 text thin, brownish, with mild but mawkish taste ; lamellae sinuate- 

 adnate, subcrowded, broad, plane, white to purplish, then black; 

 spores ellipsoid or ovoid, smooth, opaque, sometimes apiculate, 

 very dark-bay under the microscope, about 12 x 7^; stipe sub- 

 cylindric, subglabrous, floccose above, hollow, white, 4 cm. long, 

 3-4 mm. thick. 



Type locality : Redding, Connecticut. 

 Habitat : On a pile of decaying leaves. 

 Distribution : Known only from the type locality. 

 Type collected by F. S. Earle (381) on July 17, 1902. 



7. Psathyrella betulina Peck, Bull. Torrey Club 34: 101. 



1907 



Pileus thin, submembranaceous, fragile, conic or convex, some- 

 times broadly umbonate, 1-2.5 cm - broad; surface glabrous, ato- 

 mate, hygrophanous, fuscous or dark-brown when moist, paler 

 when dry; lamellae broad, adnate, subdistant, cinereous, becoming 

 black, white on the edges; spores ellipsoid, black, 8-10 x 5-6 fi; 

 stipe fragile, equal, hollow, glabrous, shining, white, 2.5-5 cm - l° n g' 

 1-2 mm. thick. 



Type locality : Stow, Massachusetts. 



Habitat : On decaying branches of white birch. 



Distribution : Known only from the type locality. 



The type specimens are at Albany, collected by Simon Davis on 

 September 26, 1906. They resemble species of Atylospora, but 

 the spores are black. 



8. Psathyrella Bartholomaei Peck, Bull. Torrey Club 22 : 



490. 1895 



Pileus thin, subconic or convex, 1.5-3 cm - broad; surface gla- 

 brous, striate on the margin, pale-bro\vn ; lamellae crowded, nearly 

 plane, adnate, brownish, becoming black; spores ellipsoid, 10-13 x 

 5-6.5 fju; stipe slender, flexuous, hollow, adorned with a few grayish 

 fibrils, pale-brown, 2.5-4 cm. long, scarcely 2 mm. thick. 



Type locality : Rockport, Kansas. 



Habitat: On wet ground in woods; also in greenhouses. 

 Distribution : Ohio and Kansas. 

 Illustration : Hard, Mushr. /. 281. 



