606 



arched, roughened by the prominent perithecia, shining, black inside 

 and out. Ascigerous cells (perithecia) thickly crowded, globose, nar- 

 rowed above into the punctiform, subprominent, finally umbilicate 

 ostiola. Asci oblong, often broader below, sessile, 38-44 x 12-12| fi. 

 Sporidia biseriate, elliptical, ends rounded, the septum above the mid- 

 dle, not constricted, greenish-hyaline, 12-14x5 //. 



On living leaves of Betula nana, B. intermedia, and B. glandu- 

 loscc, Amitsuarsuk and Holstensborg, Greenland. Sent also from 

 Maine, on leaves of Betula populifolia, by Rev. Jos. Blake, and 

 reported from New York State by Mr. Peck. 



D. Aliii, Pk. 40th Rep. N. Y. State Mus. p. 71. 



Stroma orbicular (4-12 mm.), thin, convex and black above, con- 

 cave, brown or grayish-black and papillosely rugulose below. Asci 

 cylindrical. Sporidia ovate-elliptical, obscurely uniseptate near one 

 end, hyaline, 15-20 x 7|-8f [i. 



On dead leaves of Alnus viridis, Mt. Marcy, N. Y. (Peck). 



1). Kalmise, (Pk.) 



Dothidea ICalmia;, Pk. 25th Rep. p. 102. 

 Dothidella Kalmics^ Sacc. Syll. 5264. 



Thin, effused, investing the branches, black, shining, brownish 

 within. Asci linear. Sporidia uniseptate, constricted, subhyaline, 

 10-12x5-6 [x, the cells generally nucleate and unequal. 



On branches of Kalmia angustifolia, Saudlake, N. Y. (Peck). 



The fungus forms a black crust which entirely surrounds the 

 smaller branches and which, in fertile specimens, is dotted with the 

 black ostiola. Within, it resembles half-charred wood. It kills the 

 branches. In the young stage, before the development of the asci, 

 simple, oblong, spore-like bodies 20 (i long are produced. 



D. Osmiindse, (P. & C.) 



Dothidea Osmundcs, P. & C. 30th Rep. p. 64. 

 ' Dothidella Osmundes, Sacc. Syll. 5268. 



Minute, linear, erumpent through a narrow cHink, scarcely emer- 

 gent, black, nuclei whitish. Asci subcylindrical. Sporidia oblong, 

 narrow, uniseptate, slightly constricted, colorless, 14-17 ii long, one 

 cell usually a little swollen at the septum. 



On dead stems of Osmunda, New York and New Jersey. 



The N. J. specc. have the sporidia only about 12 /z long. 



D. sciitula, (B. & C.) 



Dothidella scutula, B. & C. Grev. IV, p. 105. 

 , Dothidella scutula, Sacc. Syll. 5270. 

 Bxsicc. Rav. F. Am. 385.— Rab. F. B. 3559.— Ell. N. a! F. 684. 



