flic Ayariiiucai' of Ohio. 525 



RL'SSILA I'I'.KS. 



A.' Lamellae conspicuously une(|ual. short and loiii,^ alteniat- 

 wg; pileus i'wm, margin even, llesli thick. 

 Jj.' I'ileus changing color in age or in drying. 



C Pileus hecoming smoky-brown or blackish. 



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

 pileus somewhat viscid ; flesh turning reddish 

 then l)lackisli. S. 453; M. V>. 116: 68; K. 

 65; ^k^ 187; U. 184; St. 2: 114. 



A', nigricans (Bull.) Fr. 

 D.- Lamellae close, rather narrow, thin. 



E.^ Pileus viscid when moist. ^1. IL 116: 69: 

 Oh. Nat. 10: 1 77-8... A', subsordida Peck 

 E.- Pileus not viscid. 



F.' Flesh of pileus not changing color when 

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

 66; Mc. t88; IT. 183; St. 2: 114. 



R. adiista (Pers.) Fr. 

 I".-' Mesh changing color when wounded. 

 G.' Flesh becoming reddish then black- 

 ish when wounded. S. 454: M. 

 B. 116: 70; K. 67; H. T97. 



R. densifolia Seer. 

 G.- Flesh becoming blackish without as- 

 suming reddish tint. S. 459 ; M. 

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



186 R. sordida Peck 



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



M. B. 116: 71 R. compacta 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; TT. 182: ^[c. 190; St. 2: 115. 



R. dclica Fr. 

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

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



R. uwrqani Sacc. 



