April 1908] North American Species of Agaricaceae 67 



cm. or more long, 4-15 mm. thick. The size appears to be quite 

 variable, there are small forms, while the stature is sometimes 

 gigantic. 



28. HYPHOLOMA AGGREGATUM Peck, 46 N. Y. 

 Rep. 1892. 



Pileus thin, convex, or subcampanulate, grayish-white, ob- 

 scurely spotted with appressed brownish fibrils. Stipe rather 

 long, hollow, somewhat floccose or fibrillose, white. Lamellae 

 subdistant, rounded behind and nearly free, at first whitish, then 

 brown or blackish-brown with a whitish edge ; spores brown, 

 elliptic, 7-8 X 4-5 mic. 



Densely caespitose ; growing at the base of trees and stumps 

 in woods. New York, Peck. Pileus 2-3 cm. in diameter; stipe 

 5-7 cm. long, 3-4 mm. thick. 



VIII. STROPHARIA Fries, Monographia I, 1857. 



Pileus fleshy, convex then expanded, the surface various; 

 the veil marginal, zvhen the pileus expands all or most of it left 

 behind upon the stipe. Stipe tubulous or sometimes solid, gla- 

 brous or more often fibrous-scaly ; the annulus entire or lacerate, 

 usually persistent. Lamellae adnexed or adnate, becoming at 

 length brown or purple-brown, spores brown or purplish-brozvn. 



A genus corresponding to Armillaria and Pholiota. 



§ I. FIBRILLOSAE. Dermis of the pileus radiately 

 fibrillose, the surface not viscid. 



I. SPINTRIGERAE. The fibrillae innate, the surface of 

 the pileus smooth and glabrous; the stipe also nearly akvays 

 glabrous. 



a. Stipe solid, white or zvhitish. 



I. STROPHARIA JOHNSONIANA Peck, 54 N. Y. 

 Rep. 1900. Agaricus Johansonianus Peck, 23 N. Y. Rep. 1870. 

 Pileus fleshy, convex then expanded, obtuse ; the flesh rather 

 thin, soft, white ; the surface smooth, glabrous, yellowish in the 

 center, outwardly white ; the margin striatulate when mdist. 

 Stipe solid, equal, white, smooth, striate at the summit; the an- 

 nulus tumid, white, persistent. Lamellae rather narrow, close, 

 rounded behind and slightly adnexed, white, becoming brown ; 

 spores brown. 



Growing in grassy ground in pastures; New York, Peck. 

 Pileus 5-10 cm. in diameter; stipe 5-10 cm. high, 6-10 mm. thick. 



