424 



D. rhoina, (C. & E.) 



Diatrype rhoina, C. & E. Grev. Vlt, p. 8, Cke. Syn. 1623. 

 Calospora rhoina, Sacc. Syll. 3707. 

 Exsicc. EH. & Evrht. N, A. F. 2d Ser. 1953. 



Perithecia subeircinate, 8-20 in a group, globose, |-J mm. diam., 

 the lower part sunk in the wood, necks convergent and erumpent in a 

 compact fascicle of stout but short, cylindrical ostiola, which perforate 

 the epidermis, but do not rise much above it, their tips rounded or 

 obtusely conical, and finally with a large irregular opening. Stroma 

 variable, orbicular, irregular in outline, often widely confluent and con- 

 tinuous for several inches, faintly circumscribed. Asci oblong-clavate, 

 p. sp. 60x8-10 fi. Sporidia biseriate, oblong-fusoid, 2-4-nucleate, 

 becoming uniseptate and slightly constricted, 12-15 x 2J-3 fju 



On dead Rhus venenata, Newfield, N. J. 



On a section exposing the perithecia they seem to lie almost 

 evenly scattered. Sec. Cooke, the sporidia are 1-5-septate, 40x4 /i, 

 but we can only find them as stated above. 



D. acerina. (Pk.) 



Valsa acerina, Pk. 28th Rep. p. 74. 

 Diaporthe acerina , Sacc. Syll. 2365. 

 Valsa albocincta, C. & P. in Cke. Valsei of the U. S. No. 64, (fide Peck). 



Perithecia sunk in the wood, |-| mm. diam., in subcircinate 

 groups of 6-10, circumscribed by a black line which penetrates deeply 

 into the wood and encloses a space considerably larger than that occu- 

 pied by the perithecia. Ostiola erumpent through the ruptured epi- 

 dermis (which is also slightly raised), stout, short-cylindrical, obtuse, 

 perforated, enveloped in a sulphur-yellow, grumous substance which 

 finally disappears. The wood of the stroma within the circumscribing 

 line is also tinged sulphur-yellow. Asci oblong-fusoid, p. sp. about 

 60x8-10 /jl. Sporidia biseriate, oblong or subelliptical, subobtuse. 

 12-15x4 /1, uniseptate and constricted. 



On dead Acer spicatum, Indian Lake, N. Y. (Peck), London, 

 Canada (Dearness). 



D. eiisticha, E. & E. (in Herb.) 



Perithecia small ({ mm. diam.), buried in the unaltered substance 

 of the litter bark in groups of 8-12, the ostiola converging and seriate- 

 erumpent in a black, convex-hemispherical disc which is loosely but*. 

 rounded by the ruptured epidermis. Asci clavate, 40-50 x 6-7 ft. 

 aparaphysate, 8-spored. Sporidia biseriate, cylindric-fusoid^-nuclcatc. 

 hyaline, straight, uniseptate, scarcely constricted, 12-15 x3-3| fi. 



