546 Proceedings of the Ohio State Academy of Science. 



C.- Pileus some shade of brown, or gray; stipe stuffed 

 or hollow. 

 D/ Pileus not umbonate; stipe pruinate. S. 694; 

 M. B. 131: 56; M. 99; St. 198; H. 244; Mc. 



153 E. rJiodopolium Fr. 



D.^ Pileus umbonate; stipe fibrillose or glabrous. 

 E.^ Stipe brown or brownish, 2-4 mm. thick. 

 S. 698; A. 145; M. B. 131: 57; M. 99. 



E. strictius Peck 



E.- Stipe white or grayish, 4-8 mm. thick. S. 



694; St. 198; Mc. 252; H. 247; M. B. 



131: 57; M. 99 E. clypeatum Linn. 



B.^ Pileus moist or subviscid, not hygrophanous. 



C.^ Stipe brown or brownish; pileus of same color, 

 streaked wnth darker Hues. H. 245-6; J. M. 12: 



236-7 E. siihcostatum Atk. 



C.^ Stipe white to rufescent. 



D.^ Stipe solid ; pileus subumbonate ; plants not 

 growing on wood. S. 682. 



E. demetriacum B. & Mont. 

 D.^ Stipe hollow^ ; pileus plane or depressed ; plants 

 growing on decaying wood. S. 683. 



E. robins onii B. & Mont. 



CLITOPILUS FR. 



A.^ Stipe stuffed or hollow ; pileus hygrophanous, brown to 

 grayish-brown, usually umbilicate, striatulate when moist. 

 S. 9: 86; H. 251; P. R. 42: 43; Mc. 260. 



C. suhvilis Peck 

 A.^ Stipe solid ; pileus not hygrophanous, not umbilicate, not 

 striatulate. 

 B.^ Pileus thin, rimose-areolate ; taste bitter. S. 702; P. R. 



42: 45; H. 252; Mc. 264 C. novehoracensis Peck 



B.^ Pileus rather thick, not rimose ; taste mild. 



C.^ Pileus pruinate or mealy ; lamellae subdistant ; stipe 

 glabrous or villous at the base. S. 699 ; St. 202 ; 

 Mc. 255; P. R. 42: 41; H. 249; A. 143. 



C. prunulus Scop. 



