208 



Mycologia 



Habitat : In sandy soil among grass in fields. 

 Distribution : Known only from the type locality. 

 A number of specimens, preserved at Albany as the types, were 

 collected by Dr. G. Clyde Fisher on March 29, 1910. 



12. Agaricus cretacellus Atk. Jour. Myc. 8: no. 1902 



Pileus thin, convex to expanded, gregarious or sometimes a few 

 joined at the base, 4-7 cm. broad; surface smooth, slightly viscid 

 in wet weather, white with a yellowish tint at times ; context white, 

 or rarely with a pink tint, with odor and taste of almonds ; lamellae 

 narrow, free, narrowed behind, white at first, then pink, later be- 

 coming grayish-brown, not becoming black ; spores 4-5 x 3 fx ; stipe 

 tapering from the enlarged base, white, smooth above the annulus, 

 chalky-white below and covered with minute, white, powdery scales 

 often arranged in irregular concentric rings below, solid, with the 

 center less dense, 5-8 cm. long, 6-10 mm. thick ; annulus persistent, 

 white, smooth above, the lower surface with very fine floccose 

 scales similar to those on the stipe from which the annulus is 

 separated. 



Type locality : Ithaca, New York. 

 Habitat : On leaf-mold in woods. 

 Distribution : New York and Michigan. 



Kauffman says it is infrequent in Michigan in early autumn, 

 growing gregariously on leaf-mold in coniferous regions. 



13. Agaricus pratensis Scop. Fl. Carn. ed. 2. 2 : 419. 1772 

 Agaricus arvensis Schaeff. Fung. Bavar. Ind. 73. 1774. 



Pileus convex to expanded, 6-15 cm. broad; surface dry, sub- 

 shining, glabrous or decorated with small fibrillose scales, white, 

 becoming yellowish with age or on drying ; context white, becoming 

 yellowish, thick, highly flavored and easily digested, with an agree- 

 able odor; lamellae free, crowded, broad, at first pallid, becoming 

 slowly grayish-pink, and finally blackish-brown; spores very 

 broadly ellipsoid, smooth, pale-purplish-brown under the micro- 

 scope, blackish-brown in mass, about 7 x 5.5 stipe glabrous, 

 stuffed or hollow, white, becoming yellowish when bruised, often 

 enlarged at the base, 5-10 cm. long, 8-16 mm. thick; annulus of 

 two parts, membranous and white above, radiately split and tinged 

 with yellow below. 



Type locality : Bavaria. 



