479 



scribing line, 6-10 in number, and about ^ mm. diam., with membran- 

 aceous, coarsely cellular walls. Ostiola very short, united and con- 

 cealed in a circular disk, |-| mm. diam., and entirely covered by the 

 epidermis through which its outline is seen as a small, black circle, 

 with a black dot in the center. Asci clavate, 70x]2 p.. Sporidia 

 crowded, cylindrical, yellowish, curved, 15-20 x 4-6 p. 



On dead stems of MeniHpermu.m Canadense, Iowa (Holway). 



On stripping off the epidermis, the perithecia sometimes adhere to 

 it, and sometimes remain buried in the surface of the inner bark. 

 Closely allied to Valsa amhiens, Fr., but differs in the nature of its 

 permanently covered disk. 



V. opnlifolia, Pk. 38th Rep. i). 103. 



Pustules subcorneal, or subhemispherical, erumpent. Perithecia 

 5-20 in a pustule, nestling in the inner bark, crowded, often angular 

 from mutual pressure. Ostiola crowded, black, obliterating the gray- 

 ish disk. Asci subclavate, p. sp. 30-45 x 6-7 fi. Sporidia allantoid, 

 crowded above, uniseriate below, 10-12 x 2-2J p.. 



On dead branches of Spiraai opulifolia, West Albany, N. Y. 

 (Peck). 



Apparently related to V. piistulata, Awd., but tlie crowded osti- 

 ola are central in the disk. When the epidermis is torn away, the 

 pustules appear much like those of V. coUicidus, Worrask. We have 

 seen no specc, and take the above diagnosis and remarks from tlie 

 Report cited. 



V. leucostoiiioides, Pk. 38th Rep. p. 193. 



Pustules numerous, minute, covered by the epidermis, which is 

 pierced by the orbicular, white, or grayish disk. Perithecia 2-6 or 

 more in a pustule, the ostiola punctiform, black, dotting the disk. Asci 

 clavate or subfusoid, 49-50 x8|-10 //. Sporidia ci^owded, allantoid, 

 coloriess, 12-18x4-5 p. 



On branches of sugar maple, Helderberg Mts., N. Y. (Peck). 



The very small size of the pustules, and the minute, white, pulver- 

 ulent disk, make this species resemble V. Jencostoma, but there is no 

 black, circumscribing line. 



V. coryneoides, B. & C. Grev. XIV, p. 47. 



Pustules very small, at first covered, then erumpent. Perithecia 

 few subo-lobose. Ostiola crowded in a black disk. Asci clavate. 

 Sporidia allantoid, hyaline, 10-12 p long. 



