480 Proceedings of the Ohio State Academy of Science. 



KEY TO THE SPECIES. 



AMANITA PERS. 



A.^ Volva persistent as a loose cup about base of stipe ; pileus 

 not scaly from remnants of volva. 

 B.^ Pileus orange-red or yellow; lamellae yellow. S. 8; 

 H. 40; M. 57; Mc. 12; A. 70; P. R. 33: 41- 



A. caesarca Scop 



B.- Pileus white, rarely yellow or brownish, never orange- 

 red ; lamellae white. 

 C.^ Stipe bulbous ; margin oi pileus even. 



D.^ Stipe rooting; spores elliptical. S. 14:64; H. 

 28; Mc. 10; P. R. 50:96. 



A . magnivelaris Peck 



D.- Stipe not rooting; spores globose or subglobose. 



E.^ Pileus dry ; lamellae adnexed ; volva circu- 



.larly split. S. 10; H. 35; Mc. 10; St. 4. 



A. map pa Fr. 

 E.- Pileus viscid or slightly so when moist; lam?l- 

 lae free; volva bursting at top, not circu- 

 larly split. 

 F.^ Lamellae broad; stipe nearly smooth. 

 S. 9; H. 20; Mc. 7; A. 55: St. 4; 



P. R. 33 : 42 A. phalloides Fr. 



F.- Lamellae linear-lanceolate ; surface of 

 stipe torn into scales ; pileus often 

 lobed. S. 9; H. 23; Mc. 6; A. 61; 



St. 3 A. z'irosa Fr. 



C- Stipe not bulbous ; margin of pileus narrowly striate. 

 S. 12; H. 43; ^Ic. 11; P. R. 33:42; A. 6g. 



A. spreta Peck 

 A.- Volva forming a closely fitting or adnate sheath, or concen- 

 tric rings about base of stipe, or wholly friable ; pileus 

 usuallv with wartv scales. 



