220 THE AGARICACEAE OF MICHIGAN 



as figured by Cooke and Massee always has yellowish brown my- 

 celium radiating from the base of the stem. Saccardo, Syll., Vol. 5, 

 p. 1092, says that in Italy this plant grows upon Ozonium stuposum 

 Fr. The writer has sometimes found our plant growing from masses 

 of yellow ozonium, upon decaying maple, black locust and black ash 

 logs. It appeared once in our laboratory cultures upon mycelium 

 which was white at first then gradually became yellowish brown. 

 This is not the only Coprinus, however, which grows from a yellow 

 ozonium. G. radians resembles G. laniger from which it may be 

 separated by the much smaller scales upon the pileus. 



VELIFORMES. Pileus very thin, plicate-sulcate, splitting along 

 the lines of the gills. Plants usually small. 



Section VII. Cyclodei. Stem with a movable ring. Plants small. 



205. Coprinus bulbilosus Pat. 

 Patouillard, Tab. Anal. Fung.. GO. 



Illustrations: Ibid, Fig. G58. 

 Plate XL of this Eeport. 



PILEUS 8-10 mm. across, convex, margin striate, at first incurved 

 then expanding, gray, disk tinged yellow, covered with white meal. 

 GILLS narrow, gray. STEM 2-3 cm. long, slender, white, base 

 bulbous, ring loose, at some distance from base, white. SPORES 

 8-9 x 7-8 x 4 niicr., compressed, oval to subglobose. 



On horse dung. Readily grown in cultures from spores. Sac- 

 cardo, Sylloge, says "spores angular." In our specimens the spores 

 are slightly angular as seen in one plane. 



Section VIII. Lanulati. Pileus covered with a downy or cottony 

 layer which often has the appearance of a dense coat of soft mealy 

 vesicles. 



206. Coprinus stercorarius Fr. 

 Fries, Epicr., p. 251. 



Illustration: Cooke, 111., PI. 685 A. 



PILEUS 1-25 cm. high, ovate then companulate, sometimes ex- 

 panded and rolling up at the margin, very thin, margin striate, 

 densely covered with a white glistening meal. GILLS adnexed, 



