Tlic Agaricaccac of Ohio. b'lb 



RUSSULA PERS. 



A} Lamellae conspicuously unequal, short and long alternat- 

 ing; pileus firm, margin even, flesh thick. 

 B.^ Pileus changing color in age or in drying. 



C.^ Pileus becoming smoky-brown or blackish. 



D.^ Lamellae distant or subdistant, broad, thick ; 

 pileus somewhat viscid ; flesh turning reddish 

 then blackish. S. 453; M. B. 116: 68; K. 

 65; Mc. 187; H. 184; St. 2: 114. 



R. nigricans (Bull.) Fr. 

 D.- Lamellae close, rather narrow, thin. 



E.^ Pileus viscid when moist. M. B. 116: 69; 

 Oh. Nat. 10: 177-8... i?. siibsordida Peck 

 E.^ Pileus not viscid. 



F.^ Flesh of pileus not changing color when 

 wounded. S. 454; M. B. 116: 70; K. 

 66; Mc. 188; H. 183; St. 2: 114. 



R. adusta (Pers.) Fr. 

 F.- Flesh changing color when wounded. 

 G.^ Plesh becoming reddish then black- 

 ish when wounded. S. 454; M. 

 B. 116: 70; K. 67; H. 197. 



R. densifolia Seer. 

 G.- Flesh becoming blackish without as- 

 suming reddish tint. S. 459 ; M. 

 B. 116: 69; K. 66; Mc. 190; M. 



186 R. sordida Peck 



C.- Pileus becoming tawny or ochraceous. S. 9 : 59 ; 



M. B. 116: 71 R. compacfa Frost 



B." Pileus not changing color in age or in drying. 



C.^ Pileus white, glabrous ; lamellae white. S. 455 ; M. 

 B. 116: 72; K. 64; H. 182; Mc. 190; St. 2: 115. 



R. delica Fr. 

 C.- Pileus sordid to lirown, flocculose ; lamellae becom- 

 ing somewhat flesh-color. S. 468; M. 187. 



R. morgani Sacc. 



