514 Proceedings uf the Ohio State Academy of Science. 



C.- Lamellae not long dccurrent; (sometimes uncinate or 

 subdecurrentj. 

 D.' Pileus viscid when moist; stipe with minute 

 blackish tomentum. S. 363; AI. 80; Ale. 145; 

 A. 109; St. 175; P. R. 39:()2 



P. serotinus Schrad. 

 D.- Pileus and stipe not as above. 



K.' Lamellae broad, sinuate; pileus glabrous; 

 stipe thick, solid. S. 341; P. R. 39:60; 

 H. 157; Al. 78; Ale. 138; A. 102; St. 167. 



P. ulinariiis Bull. 

 E.' Lamellae rather narrow, adnata to subdecur- 

 rent. 

 F.^ Pileus grayish to brownish, glabrous; 

 stipe solid. S. 343; M. 78; St. 169. 



P. craspedius Fr. 

 F.- Pileus white, pruinate or floccose ; stipe 

 stuffed or hollow. 

 G.^ Lamellae adnate to emarginate ; stipe 

 subvillous ; pileus somewhat irreg- 

 ular. S. 344; St. 170; AL 78; P. 

 R. 39 : 60 ; Ale. 140. 



P. lignatilis Fr. 

 G.- Lamellae adnate to subdecurrent ; 

 stipe glabrous, pileus orbicular. S. 

 344; H. 163; Ale. 140; St. 171. 



P. circinatus Fr. 

 B.^ Stipe wanting; pileus definitely sessile or resupinate. 



C.^ Pileus less than 8 mm. broad, cup-shaped when 

 young, gray, bluish-gray or nearly black. S. 379 ; 



H. 161 ; A. 109; St. 180 P. applicatus Batsch 



C.^ Pileus usually 2 cm. or more broad. 

 D.^ Pileus glabrous or nearly so. 



E.^ Lamellae very narrow : pileus somewhat 

 spatulate, not viscid when moist. S. 361 ; 

 P. R. 39:64; H. 157; Ale. 144; St. 174, 

 A. 107 P. petaloides Fr. 



