349 



ed by a fringe of stout, black, reflexed hairs. Asci broad, oblong- 

 elliptical. Sporidia muriform, yellow, slightly constricted across the 

 middle, 33-37 x 15-18 /i, transversely 7-septate, the cells divided by 

 2-3 longitudinal septa. 



On dead stems of Phlox, Utah. 



Pyr. Zabriskieana, E. & E. Proc. Acad. Nat. Sci. Phil. July, 1890, 



p. 238. 



Perithecia loosely gregarious, erumpent-superficial, ovate-globose, 

 175-200 /j. diam.. densely clothed with straight, erect, sparingly-septate, 

 yellowish-brown hairs 100-125 ft long and about 5 [i thick at the base, 

 tapering gradually to the subacute tip, of membranaceous texture and 

 dark yellowish-brown color (under the microscope). Asci clavate- 

 oblong, 100-125 x 22-25 //, rounded above, with a short, abrupt, stipi- 

 tate base. Paraphyses slender and numerous but inconspicuous. 

 Sporidia crowded-biseriate, ovate-elliptical, densely muriform, rounded 

 at the ends, yellowish-brown, 22-30 x 12-14 /jl, constricted across the 

 middle. The sporidia are so closely and densely muriform as to 

 appear granular, the granular contents being arranged in transverse 

 lines across the sporidia so that they appear 12 or more septate. 

 Differs from P. polyphragmia, Sacc. to which it comes nearest, in its 

 smaller perithecia and shorter sporidia. 



On bark of Ulmus Americana, New Baltimore, N. Y. (Zabriskie). 



Pyr. comata, (Awd. & Niessl). 



Pleospora comata, Awd. & Niessl in Niessl Beitr. Zur Kent, der Pilze, p. 30. 

 Pyrenophora comata, Sacc. Syll. 3864, Cke. Syn. 5169. 

 Exsicc. Rab. F. E. 1544. 



Perithecia scattered, covered by the epidermis, only the short, 

 conical ostiolum projecting and surrounded by a tuft of straight, simple, 

 black, divergent bristles, spherical, of coriaceo-membranaceous texture, 

 black, 180-220'// diam. Asci broad, oblong or oblong-clavate, sessile, 

 with a broadly-rounded apex, 8-spored, 110-130x40 //, paraphysate. 

 Sporidia biseriate, oblong-ovate, often oblique, at first with 7-9, later 

 with 11-13 (or more) septa, with 2-3 more or less perfect longitudinal 

 septa, dark brown, opake, 32-38 x 14-16 ju. 



On Ahine, Cerastium, Melandrium, Viscaria, Pyrola, Pedicu- 

 laris, Oxyria, Luzula, Draba Saxifraga, in Western Greenland. 



Pyr. chrysospora, (Niessl.) 



Pleospora chrysospora, Niessl. Hedw. 1880, p. 173. 

 Pyrenophora chrysospora, Sacc. Syll. 3861, Cke. Syn. 5165. 

 Exsicc. Kz. F. Sel. 581. Rab. F. E. 2860. 



