572 Proceedings of the Ohio State Academy of Science. 



B.- Pilens usually more than 15 nini. broad, yellow or rufes- 

 cent when fresh. S. 1134; ^t. 346; J. ^I. 13 o7- 



P. crenata Lasch 



A.- Pileus striate or striatulate, not sulcate. 



B.^ Pileus with tufts of hair at least when young, brown or 

 reddish-brown. S. 14:163; H. 348; J. M. 13:55; 



P. R. 50 :i07 P. hirta Peck 



B.- Pileus not hairy-tufted. 



C Lamellae close; plants odorous. S. 1136; P. R. 



24:70; J. M. 13:54 P- odorata Peck 



C- Lamellae rather distant. 



D.^ Pileus campanulate, sprinkled with shining par- 

 ticles. S. 1 1 32; St. 346; Mc. 390; J. M. 



13 :57 ; M. 117 P. atomata Fr. 



D.' Pileus conical, not atomate, stipe naked. S. 

 1127; St. 343; Mc. 389; J. M. 13:56; M. 117. 



P. gracilis Pers. 

 Note. 



P. falci folia and P. rupincola, described from SuUivant's 

 material by Montague, are omitted. (See S. 1129, 1134. and 

 J. M. 13:55.) 



