NATURAL HISTORY SURVEY 97 



Coprinus fimentarius Fr. 



Pileus membranaceous, thin, at first cylindrical, at length revo- 

 lute and torn at the margin, when young covered with floccose- 

 squamose white scales which separate from the vertex toward 

 the circumference, at length naked, longitudinally cracked but 

 not opening into furrows, the vertex, which remains entire, livid. 



Lamellae free, reaching the stem, at first ventricose then 

 linear, flexuous, black. 



Stem hollow, fragile, thickened and solid at the base, at- 

 tenuated upwards, shining white and villous with squamules of 

 the same color. 



On dung in a woodland pasture, River Forest. June. 



Coprinus micaceus Fr. 



Pileus oval then campanulate, margin plicate and irregular, 

 striate, tawny-ochraceous, at first covered with glistening mi- 

 caceous particles, soon naked and becoming sulcate. 



Lamellae adnexed. 



Stem white, silky, hollow. 



Pileus 3 to 6 cm. broad; stem 5 to 8 cm. long; spores 7 to 8 x 4 

 to 5 fji. 



In sodded ground along a railroad track, Glen Ellyn. On 

 stumps of street trees, Wheaton. May and October. Lake 

 Mew at the base of trees, in great clumps. Pepoon. Found 

 growing on the mycelium of Ozonium auricomum Lk.,on rotten 

 log at River Forest. October, 1903. 



Coprinus plicatilis Fr. 



Pileus very delicate, cylindric-ovate then campanulate, soon 

 plane, coarsely grooved, glabrous, pale-brown, then grayish, 

 disk broad, even, at length depressed, darker. 



Lamellae free, attached to a collar, distant from the stem. 



Stem white, smooth, hollow. 



Pileus 1 to 2 cm. broad; stem 5 to 8 cm. long; spores 11 to 13 

 x S to 9 /x. 



Mulching about shrubs, garden, Wheaton. June. Ephemer- 

 al, disappearing before the middle of the forenoon. The pileus 

 is of a dull, lead-gray color. The spores of our specimens vary 

 much in size and shape. They are black, elliptic-oblong, some- 

 what irregular, frequently mucronate at one end, 9 to 15 x 6 to 8 /u,. 



In manure about a greenhouse, Chicago. May. Pepoon. 



Coprinus "ephemeras Fr. 



Pileus very delicate, ovate then campanulate, sulcate, slightly 

 scurfy at first, disk elevated, even, rufescent. 



Lamellae slightly adnexed. 



Stem glabrous, pellucid, whitish, hollow. 



Pileus 1 to 2 cm. broad; stem 3 to 6 cm. long; spores 16 to 

 17 x 9 to 10 *. 



