638 Proceedings of the Ohio State 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. II : 203. 



M. rigidus Mont. 

 G.^ Pileus not striate. 



H.^ Lamellae rather broad; stipe- 

 thickened below. S. 513; J. 

 M. II : 203. 



M. spongiosus B. & C. 



H.^ Lamellae rather narrow ; stipe 



not thickened at base. S. 521 ; 



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



II : 209. .M. velutipes 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. 11: 



236 M. gregarius 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; H. 148; jNL 

 192; J. M. II : 204. 



M. fagineus Morg, 



