CLASSIFICATION OF AGARICS 217 



199. Coprinus arenatus Pk. 

 Peck, N. Y. Stat.- Mus. Rep. 16, p. L07, L892. 



PILEUS 2.5-5 cm. broad, thin, a1 firsl broadly ovate or sub- 

 hemispherical, soon convex or campanulate, adorned with small 

 white tomentose scales, striate on the margin, whitish or grayish- 

 white, becoming grayish brown with age, reddish brown in dried 

 plant. GILLS crowded, broad, free, grayish-white, soon purplish- 

 brown, finally Mack, furnished with numerous cystidia. STEM 

 l\ .")."> cm. long, 2 I mm. thick, equal, glabrous, hollow, white. 

 SPORES 7.5-9x6-7.5 micr., broadly ovate or subglobose, purplish 

 brown by transmitted light. 



Solitary or gregarious in sandy soil, Ann Arbor. The mycelium 

 binds the sand together in balls at the base of the stem. 



200. Coprinus niveus Fr. 



Pries, Epicr., p. 2 Hi. 



Illustration: Cooke, 111.. PI. 673 B. 



PILEUS 1.5-2.5 cm. across, elliptical then campanulate and ex- 

 panded, submembranaceous, almost persistently covered with 

 snow-white floccose down. GILLS slightly attached, narrow, be- 

 coming blackish. STEM t-8 cm. high, subequal or slightly attenu- 

 ated upwards, villose, white, hollow. SPORES 16x11-13 micr. 



This planl is frequently found upon dung heaps, streel sweepings 

 or in recently manured ground. Upon the pileus the veil is of a 

 mealy nature but the tomentose character shows a1 the margin of 

 the pileus and upon the stem. The spores are somewhat flattened, 

 measuring L5-17x ll to 13x8-10 micr. 



The plant referred to this species is C. stercorarius (Bull.) Fr. 

 and has been distributed under that name in Sydow Mycotheca 

 Marihoa. No. 2101. 



201. Coprinus semilanatus Pk. 



N. V. State Mus. Rep. 24, p. 71, L872. 



Illustrations: N. Y. State Museum Report 24, PI. I. Fig. 15 18. 



PILEUS 2-2,5 cm. broad, convex then expanded and revolute, 

 sometimes split, submembranaceous, finely and obscurely rimose 



