1894.] NATURAL SCIENCES OF PHILADELPHIA. 335 



Cache la Poudre Rivers, Colo., July, 1894 (Prof. C. S. Crandall, 

 No. 11), alt. 9,000 ft. 



Perithecia evenly scattered, subcuticular but promiuent, de})ressed- 

 hemispherical, 100-120// diam., pierced above. Asci fasciculate, 

 aparaphysate, oblong, mostly broader near the base, sessile, 8-spored. 

 Sporidia 2-3-seriate, crowded, clavate-oblong, obtuse, uniseptate and 

 slightly constricted at the septum, 15-20 x 32-4^'/. 



Difters from S. Aquilegice E. & G. in its depressed perithecia and 

 narrower sporidia. 



Didymella Myricae E. & E. 



On dead twigs of Myriea cerijera, Kiamensie, Del., July, 1894 

 (Commons, No. 2,503). 



Perithecia scattered, adnate-superficial, depressed-hemispherical, 

 100-120;/. diam., with a papilliform ostiolum. Asci obovate, subin- 

 equilateral, sessile, aparaphysate, 40 x 20/'. Sporidia biseriate, 

 oblong, hyaline, uniseptate and strongly constricted at the septum, 

 ends obtuse, each cell 2-uucleate, 20 x 6-8//. The cells easily 

 separate. 



Didymella Physocarpi E. & E. 



On dead Wmhs o^ Physocarpus optdifolius, Nuttallburg, West Va., 

 May, 1894 (L. W. Nuttall, No. 488). 



Perithecia gregarious, covered by the pustuliform epidermis, about 

 i mm. diam., white inside, depressed-globose, the papilliform ostio- 

 lum barely penetrating the epidermis. Asci clavate-cylindrical, 

 short-stipitate, 85-90 x 10-12//, paraphysate, 8-spored. Sporidia 

 biseriate, fusoid, 4-nucleate, uniseptate, constricted at the septum, 

 hyaline, 19-22x4-5//, mostly a little curved. 



Didymosphaeria populifolia E. & E. 



On fallen leaves of Populus angidata, Shore of Lake Huron, 

 Ontario, Canada, May, 1894 (Dearness, No. 2,263). 



Perithecia gregarious, in suborbicular, hypophyllous groups, about 

 1 cm. across, not on any definite spots, 80-100// diam., innate, only 

 the subcouoid, minute ostiolum projecting. Asci cylindrical, short- 

 stipitate, 65-75x8-10//, 8-spored (paraphysate)? Sporidia uniseri- 

 ate, oblong, pale brown, uniseptate, slightly constricted, upper cell 

 a little broader, 12-14 x 3A-41//. 



Pleospora Richtophensis E. & E. 



Perithecia tliickly scattered, subcuticular, globose or elliptical, 



