35 



D. xyligenura, E. & E. Journ. Mycol. II, p. 102. 



Perithecia superficial, scattered, depressed-hemispherical, rough, 

 165-250 n diam., with an obscure, papilliform ostiolum. Asci obovate, 

 contracted below into a short stipe, 35-40 x 20-24 n, without par- 

 aphyses, and containing 8 oblong-elliptical, uniseptate, granular, sub- 

 hyaline, 15-16 X 8 /-J sporidia. 



On decaying wood of Salix, Louisiana (Langlois). 



Differs from the usual type of Asterina and Dim.erosjjorium in 

 its habitat, and the absence of any definite mycelium. 



D. anomalnin, (Cke. & Hark.) 



Asterina anomala, Cke. & Hark. Grev. IX, p. 87. 



"Effused, black, velvety. Perithecia hemispherical or globose- 

 depressed. Mycelium intricate, brown, with erect, rigid, scattered 

 setse. Asci clavate. Sporidia biseriate, lanceolate, 1-5-septate, hya- 

 line, 20-22x4 fi. Perithecia 80 jjl diam.; setae about twice as long." 



On living laurel leaves, California. 



Diraerosporiuin Populi, E. & E., mentioned in Journ. Mycol. V. 

 p. 81, was not published on account of the specc. proving unsatis- 

 factory. 



ASTERINA, Lev. 



Ann. Sci. Nat. 1845, III, p. 59. 



Perithecia globose-depressed or lenticular, membranaceous, sub- 

 astomous, seated on spots of black, radiating, subsuperficial (rarely 

 subinnate) mycelium. Asci typically short and thick, mostly 8-spored. 

 Sporidia two-celled, pluriseptate or continuous, hyaline or br'own. 



The perithecia vary from an entire membranaceous sac to a mere 

 covering of coalesced, radiating hyphse, and the mycelium, which 

 typically forms black spots, is often light colored, scant, evanescent or 

 entirely wanting. The genus therefore contains some species nearly 

 approaching SxihcBrella and MicrothyriuTn on the one hand, and 

 Ascomycetella on the other. 



A. Perithecia seated on a distinctly developed mycelium. 



A. rubicola, E. & E. (in Herb.) 



. Perithecia epiphyllous, erumpent-superficial, single or 2-3 to- 

 gether, conic-hemispherical, membranaceous, 75-100 pt diam., with a 

 distinct ostiolum. Asci oblong, sessile, 35-45 x 12-15 jj., with obscure 

 paraphyses. Sporidia biseriate, ovate-elliptical, yellowish-brown, uni- 

 septate, constricted at the septum, rounded at the ends, 12-15x6-8 [i. 



On leaves of Rubus strigosus and R. occidentalis, Canada and 

 Wisconsin. 



