538 Proceedings of the Ohio Stale Academy of Science. 



more than 5 cm. long. S> 

 517; P. R. 26: 66; H. 146; J. 

 M. II : 240. 



M. elongatipes Peck 



H.^ Pileus more than 12 mm. broad; 

 stipe usually less than 5 cm. 

 long, not rooting. S. 541 ; J. 

 M. 11: 203. 



M. rigidns ]Mont.. 

 G." Pileus not striate. 



H.^ Lamellae rather broad ; stipe 

 thickened below. S. 513; J. 

 M. 1 1 : 203. 



j\l. spongiosus B. (^ C. 



H.- Lamellae rather narrow ; stipe 

 not thickened at base. S. 521 ; 

 H. 140; P. R. 23: 124; J. M. 

 II : 209. .M. z'clutipes B. & C. 



E.- Stipe pruinate or minutely pubescent, not 



tomentose or velvety. 



F.- Lamellae narrow; pileus becoming um- 



bilicate, not more than 12 mm. broad. 



S. 14: 108; B. T. 23: 413; J. M. Ti: 



236 M. gregarins Peck 



F.- Lamellae rather broad ; pileus not urn- 



bilicate, usually more than i . 5 cm. 



broad. 



G.^ Lamellae distant ; margin of pileus 



slightly or not at all rugose-sul- 



cate. S. 565; J. M. 11: 203. 



M. viticola B. & C. 



G.- Lamellae rather close; margin ru- 

 gose-sulcate. S. 524; PL 148; AL 

 192; T. ^L IT : 204. 



.1/. fagineus Morg. 



