512 Proceedings of the Ohio State Academy of Science. 



C.- Lamellae narrow; plants on wood, white. S. 337; 



St. 164; M. 77 0. intcgrella Pers. 



B.- Pileus umbilicate or infundibuliform. 



C.^ Pileus silicate, yellowdsh or fading. S. 315; St. 156; 



H. 132 0. cacspitosa Bolt. 



C.- Pileus even or striatulate only. 



D.^ Pileus sooty-gray or reddish-brown, usually silky 

 or fiocculose or becoming so. 

 E.^ Pilei usually less than i cm. broad ; plants on 

 ground. S. 316; St. 156; M. 76. 



0. rnstica Fr. 



E.- Pilei usually more than i cm. broad ; plants 



on wood. S. 314; H. 130; M. 76; A. loi ; 



P. R. 45 : 37 0. epichysium Fr. 



D.- Pileus not as above. 



E.^ Pileus yellow to orange or paler, 4-10 mm. 

 broad ; stipe 2-5 cm. long. S. 331 ; St. 163 ; 

 P. R. 45:40; H. 134; M. yy. 



O. fibula Bull. 



E.- Pileus reddish-brown or grayish-red, 8-25 



mm. broad. 



F.^ Lamellae pallid ; stipe reddish-brown, 6- 



12 mm. long. S. 321; St. 158; A'L 



76 O. muralis Sow. 



F.- Lamellae flesh color, grayish-red, or pale 

 yellow; stipe pallid to rufescent, usu- 

 ally longer. S. 313; St. 154; H. 133; 

 P. R. 45 : 36 O. pyxidata Bull. 



Notes. 



O. alboflava is closely related to O. chrysophylla and is prob- 

 ably a variety of the latter. The plants figured bv Flard (p. 135, 

 f. 100) as O. alboflava agree more closely with the description of 

 O. chrysophylla. 



O. chrysea Peck, reported by Morgan (p. 75), is now re- 

 garded by its author as a variety of O. chrysophylla. 



O. rhyssospora Mont, and O. strombodes B. & Mont., de- 



