572 Proceedings of the Ohio State Academy of Science. 



B.- Pileus usually more than 15 mm. broad, yellow or rufes- 

 cent when fresh. S. 11 34; St. 346; J. M. 13:57. 



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. 50:107 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. 1 132; St. 346; Mc. 390; J. M. 



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



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

 1 127; St. 343; Mc. 389; J. M. 13:56; M. 117. 



P. gracilis Pers. 

 Note. 



P. falcifolia and P. rupincola, described from Sullivant's 

 material by Montague, are omitted. (See S. 1129, 11 34, and 

 J. M. 13:55.) 



