The Agaricaceae 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 

 the lamellae adnexed and decurrent by a tooth ; the latter, as hav- 

 ing the edge of the lamellae obtuse. In Omphalia 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, pileus usually 5-15 cm. broad, lamellae broad. S.^ 

 339-340; M. 79; Mc. 137; St. 166; A. 105-107. 



P. dryinus Pers.. 

 P. corticatus Fr. 

 A.^ Veil wanting. 



B.^ Stipe present ; sometimes short or even suppressed but 

 pileus never resupinate. 

 C.^ Lamellae long decurrent. 



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



P. acerinus 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. sapidus Kalchb. 



F.- Spores white. 



G.^ Lamellae entire, anastomosing at 

 base ; pileus glabrous. S. 355 ; P 

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



142 P. ostreatus Jacq. 



G.- Lamellae eroded, distinct at base ; 

 pileus substrigose. S. 359 ; H. 

 156; M. 79; Mc. 143; St. 173; P. 

 R. 39 : 62 P. salignus Schrad. 



