The Agaricaccae of Ohio. 613 



scribed from Sullivant's material, do not seem to agree with 

 the characters of the genus. The former is described as having 

 tlie himellae adnexcd and decurrcnt by a tooth; the latter, as hav- 

 ing the edge of the lamellae obliiae. Jn Omi)halia the lamellae are 

 truly decurrent and the edge acute. (See S. 318 and S. 333.) 



PLEUROTUS FR. 



A.^ Partial veil present, usually appendiculate about margin of 

 pileus, j)ileus usually 5-15 cm. broad, lamellae broad. S. 

 339-340; M. 79; Mc. [37; St. 166; A. 105-107. 



P. dryiniis Pers. 

 P. corticatus Fr. 

 A.- Veil wanting. 



B.' Stipe ])rcsent ; sometimes short or even suppressed but 

 pileus never rcsupinate. 

 C Lamellae long decurrent. 



D.' Pileus white, silky-villous. S. 360; St. 173. 



P. aceriniis Fr.. 

 D.- Pileus some shade of yellow or brown. 



E.^ Pileus thin ; lamellae close, linear ; stipe lat- 

 eral. S. 361; P. R. 39:64; H. 157; A, 

 107; Mc. 144; St. 174.. . .P. petaloides Fr. 

 E.- Pileus thick ; lamellae broad, subdistant. 



F.' Spores lilac in mass. S. 348 ; P. R. 

 39:61; H. 159; M. 79; A. 104; Mc. 



141 P. sapidiis Kalchb. 



F.- Spores white. 



G.^ Lamellae entire, anastomosing at 

 base ; pileus glabrous. S. 355 ; P 

 R. 39:62; H. 153; A. 104; Mc. 

 T42 P. ostreahis Jacq. 



C,.- Lamellae eroded, distinct at base; 

 pileus substrigose. S. 359; H. 

 T56: M. 79; Mc. 143; St. 173; P. 

 R. 39 -.62 P. saligiius Schrad. 



