ClBORINIA 71 



Type locality: New York. 

 Distribution: New York and Quebec, Canada. 

 Illustrations: Mycologia 37: 669, f. 6, 7; Canadian Jour. 

 Res. 18: pi. 1, f. 1-10. 



2. Ciborinia bifrons (Kllis & Ev.) Seaver, comb. nov. (Plate 

 75 (frontispiece), 88.) 



Sclerotium bifrons Ellis & Ev. N. Am. Fungi 155: Sacc. S>11. Fuiiij;. 14: 1169. 



1899. (in part). 

 Sclerotinia bifrons Seaver & Shope, Mycologia 22: 3. 1930. 

 Sclerotinia conf undens Whetzel, Mycologia 32: 126. 1940. 

 Ciborinia confundens Whetzel, Mycologia 37: 668. 1945. 



Sclerotia formed in the living leaves of the host, irregularly 

 circular in form, persistent, or dehiscent, black, thin; apothecia 

 stipitate, several to each sclerotium, minute, whitish, or slightly 

 yellowish, .5-1.5 mm. in diameter; stems variable in length, 

 usually 2-3 mm.; asci clavate, or subcylindric, 8-spored, reaching 

 a length of 50-75 ii and a diameter of 4-7 /x; spores fusoid, or 

 ellipsoid, hyaline, 2-3 X 7-10 ju; paraphyses slender. 



On sclerotia dehisced from the leaves of Populus tremuloides 

 and lying on the ground in moist places, usually embedded in 

 humus. 



Type locality: University of Colorado summer camp near 

 Boulder, Colorado. 



Distribution: Known only from the type localit>'. 



Illustrations: Mycologia 22: pi. 4; 37: No. 6, frontispiece, 

 645,/. 2. 



Exsiccati: Ellis & Ev. Fungi Columb. 155; Barth. Fungi 

 Columb. 2554. 



3. Ciborinia foliicola (Cash & Davidson) Whetzel, Mycologia 

 37: 668. 1945. 



Sclerotinia foliicola Cash & Davidson, Mycologia 25: 269. 1933. 



Sclerotia surrounding the midribs of overwintering leaves of 

 the host, .5-1 mm. wide and 14 cm. long, thick and appearing on 

 both sides of the leaf-blade. 



Apothecia stipitate at first cup-shaped, expanding and be- 

 coming almost discoid at maturity, up to 1 cm. in diameter, 

 grayish-brown; stems .5 1 mm. thick, reaching a length of 1-3 

 cm., rather stout when young, becoming slender at maturity, 

 asci cylindric, or subcylindric, attenuated below, reaching a 



