,226 THE AGARICACEAE OF MICHIGAN 



215. Coprinus plicatilis Fr. 



Fries, Epicr., p. 252. 



Illustrations : Cooke, 111., PL 686 a. 



Massee, Ann. Bot, Vol. 10, PL XI, Figs. 23-25, 1896. 

 Gillet, Champignons de France, No. 185. 



PILEUS 1-2.5 cm. across, ovate-cylindrical, then campanulate, 

 membranaceous, sulcate to disk, brown, then grayish; disk remain- 

 ing darker, rather broad, becoming depressed. GILLS distant, 

 narrow, attached to a collar at some distance from the stem. STEM 

 5-7 cm. long, 2 mm. thick, equal, white, smooth, hollow. SPORES 

 10-12 x 7.5 to 8.5 x 5-6 inicr., compressed, broadly ovate. 



Rather common among grass at roadsides, etc. 



As in the case of C. ephemeras there has been considerable con- 

 fusion of species under the name of C. plicatilis. We do not, how- 

 ever, find a'u much variation in this plant as in G. ephemerus. 



Psathyrella Fr. 

 (From the Greek, diminutive of Psathyra.) 



Black-spored. Gills at length uniformly dark-colored, not del- 

 iquescing, nor variegate-dotted. Pileus membranous, striate or 

 sulcate, margin at first straight, not exceeding the gills. Stem 

 slender, confluent. Veil inconspicuous. 



Small, thin-capped mushrooms, growing on debris in woods, on 

 the ground in low grassy places, in gardens, etc. With the excep- 

 tion of P. disseminata, the species are not well known. Peck has 

 named twelve species found in the United States and a number of 

 Friesian species are known to occur. The plants often have the 

 appearance of the small, evanescent species of Coprinus, but the 

 gills do not deliquesce. They differ from Panoeolus in the striate 

 pileus, the non-variegated gills and the margin of pileus not ex- 

 ceeding the gills. I have definitely studied only two species. 



