562 Proceedings of the Ohio State Academy of Science. 



Note. 



Lloyd thinks Bolbitius radians the same plant at Pluteolus 

 coprophihis. 



AGARICUS LINN. 

 (Psalliota Fr.) 



A.^ Pileus distinctly brown or tawny. 



B.^ Whole surface of pileus tawny-brown, fibrillose-scaly. 

 S. looo; St. 307; Mc. 334; M. 112; P. R. 36:48. 



A. silvaticus Schaeff. 

 B.^ Pileus white or whitish with numerous minute brown 

 scales, disk usually brown and smooth. S. 1003 ; P. 

 R. 36:48; Mc. 345; H. 315; A. 23. 



A. placomyces Peck 

 A.^ Pileus (except for scales if present) white or whitish or 

 somewhat yellowish; rarely brownish, never tawny. 

 B.^ Mature pileus usually more than 4 cm. broad. 



C.^ Stipe solid. S. 994; P. R. 36:45; H. 308; Mc. 336; 

 A. 20 A. rodmani Peck 



C^ Stipe stuffed or hollow. 



D.^ Plants occurring in grassy or open fields, etc. 

 E.^ Veil large, double ; lamellae long whitish or 

 pallid. S. 994; St. 305; P. R. 36:46; H. 

 310; Mc. 341; A. 21; M. III. 



A. arvensis Schaeff. 

 E.^ Veil scant, usually lacerate; lamellae soon 

 pink. S. 997 ; St. 306 ; P. R. 36 : 42 ; Mc. 

 332; H. 307; A. 18; M. 112. 



A. campester Linn. 

 D.^ Plants growing in woods or groves. 



E.^ Pileus with small brown scales, disk smooth, 

 brown. S. 1003; Mc. 345; P. R. 36:48; 



H. 315 ; A. 23 A. placomyces Pe:k 



E.2 Pileus glabrous or slightly silky, whitisii, or 

 yellowish in center. 



