336 PROCEEDINGS OF THE ACADEMY OF [1894. 



300-400/i diam., finally more or less collapsing, the papillilbrm 

 ostiolura barely piercing the epidermis. Asci clavate-oblong, short- 

 stipitate, paraphysate, 8-spored, 85-110x20-22;/. Sporidia biseri- 

 ate, oblong-elliptical, 5-septate and muriform, mostly constricted in 

 the middle, yellow-brown, end cells paler and subacute, 25-35 x 12- 

 14/i. 



On dead stems of Helianthus, Mt. Richtophen, N. W. Colo., 

 July, 1894 (C. F. Baker, No. 238). 



Pleospora alpestris E. & E. 



On decaying stems of TroUins laxus, Cameron Pass, N. W. Colo,, 

 July, 1894 (Prof C. S. Crandall, No. 4, partly). 



Perithecia scattered, innate-erumpent, ovate-globose, 250;/ diam., 

 with a papilliform ostiolum. Asci thin, evanescent, 150x25-30, 2- 

 spored (in the specc. examined). Sporidia oblong- elliptical, or 

 ovate-oblong, 50-65 x 16-24;/, mostly a little constricted in the 

 middle, multi-(9-12-) septate and muriform, deep yellow-brown. 



The perithecia have a scanty fringe of coarse, brown, mycelial 

 threads around the base. 



This differs from PL polyphragmia Sacc. in its smaller glabrous 

 perithecia not collapsing, and its larger sporidia with fewer septa. 



Pyrenophora Canadensis E. & E. 



On sheaths of Phleum pratense, London, Canada, July, 1894 (J. 

 Dearness). 



Perithecia scattered, buried with the apex erumpent, ovate, 250- 

 300;/. diam., the apex, around the scarcely prominent ostiolum loosely 

 clothed with spreading, brown, continuous hairs 50-80 x 5-6;/. Asci 

 cylindrical, 150-190 x 28-32;/ (p. sp. 110-120;/). Paraphyses not 

 seen. Sporidia 4-8, oblong-elliptical or ovate- elliptical, nearly 

 hyaline, obtuse, 3-septate, scarcely constricted, when mature one or 

 two of the cells divided by a longitudinal septum, 40-55 x 15-20;/. 



Leptosphgeria sambucina E. & E. 



On dead Sambucus melanoearpa, Cameron Pass, Colo., alt. 

 10,000 ft., July, 1894 (C. F. Baker). 



Perithecia buried, ovate-globose, 350-400;/. diam., i-aising the 

 epidermis into pustules which are whitish at first with the minute, 

 black, papilliform ostiolum visible in the center. Asci clavate- cylin- 

 drical, 100-120x12;/, paraphysate, 8-spored. Sporidia fusoid- 

 cylindrical, slightly curved, uniseptate and constricted at first, finally 



