427 



Perithecia circinate, few. nestling in the unaltered substance of 

 the bark and raising the epidermis into little pustules, small (150 ft). 

 about four together, contracted above into slender necks terminating 

 in the short, inconspicuous ostiola, which barely rupture the epidermis 

 without projecting above it. Asci oblong 25-30 x 5-6 p. Sporidia 

 biseriate, oblong-sublanceolate, slightly curved, 2-4-nucleate, unisep- 

 tate, hyaline, 6-7 x 1J-2 ft (18x5 /i, Cke.). 



On dead limbs of My vie a. Darien, Georgia (Ravenel). 



This discrepancy between Cooke's measurements and ours is 

 remarkable. We have carefully examined the specc. in Raw F. Am., 

 and find the sporidia as stated above. 



1). Woolworthii, (Pk.) 



Valsa Woolworthii, Pk. 28th Re!p. p. 73. 

 Diaporthe IVooizoorthii, Sacc. Syll. 2383. 



Minute, erumpent. Perithecia 2-6 together, nestling in the inner 

 bark. Ostiola stout, becoming umbilicate, crowded, slightly prominent, 

 barely exserted through the ruptured epidermis. Asci p. sp. 30-35 x 

 1 fi. Sporidia crowded or biseriate, oblong-fusoicl, uniseptate, scarcely 

 constricted, nearly colorless, 10-12 x2|-3| ji. v 



On dead oak and hickory branches, Greenbush, N. Y. (Peck), on 

 oak and Tilia, Canada (Dearness). 



The clusters of perithecia are very numerous and often seriate, 

 the epidermis being ruptured from one to another. What appears to 

 be the same has been sent by Mr. Langlois from Louisiana, on dead 

 limbs of white oak, with the ostiola at first erumpent through a pale 

 disk which at length disappears. 



D. farinosa, Pk. 40th Rep. p. 69. 



Stroma subpulverulent or mealy, dull buff color, formed of the 

 slightly changed inner bark, erumpent in a minute, slightly exserted 

 disk. Perithecia irregularly circinating, generally 4-10 together, the 

 clusters subconfluent. Ostiola black, dotting the prominent, pulveru- 

 lent, buff-colored or, at length, brownish disk. Asci subcylindrieal. 

 55-75 x 7|-10 fi. Sporidia crowded or biseriate, oblong or subfusi- 

 forin, uniseptate, generally 4-nucleate, 15-20 x 3 J-4 ft. 



On dead branches of Tilia Americana, Argusville, N. Y. (Peck). 



This species approaches D. furfuracea in its pulverulent stroma, 

 but differs in its prominent disk, making the branches rough to the 

 touch, and in its smaller sporidia. From D. velata it is easily sepa- 

 rated by the entire absence of any black, circumscribing line or black- 

 ened' surface. It evidently belongs to the subgenus Chorostate, but 

 the clusters of perithecia are so numerous that they form an almost 



