450 PROCEEDINGS OF THE ACADEMY OF [1893. 



has longer, coarser ostiola and longer, narrower asci, with constricted 

 sporidia. 



Pseudovalsa ulmicola E. & E. 



On dead elm limbs, London, Canada. May, 1893. (J. Dear- 

 ness, 1430c). 



Stroma orbicular or elliptical, J-l cm. diam., or by confluence 

 becoming irregular and much larger, formed of the whitened sub- 

 stance of the bark and surrounded (in a horizontal section) by a 

 black line. Perithecia ovate-globose, ?-f mm. diam., entirely buried 

 in the bark and penetrating nearly or quite to the wood, 8-20, sub- 

 circinately arranged, their necks converging and the hemispherical, 

 perforated ostiola erumpent in a minute fascicle perforating the epi- 

 dermis, but scarcely rising above it. Sporidia allantoid, yellow- 

 brown, 20-28x5-7//, 1-3-septate, ends obtuse and often swollen. 



The specc. were rather old and the asci dissolved. 



Hypoxylon discoideum E. & E- 



On bark of dead stems of the climbing var. of Rhus Toxicodendron, 

 Newfield, N. J. Dec. 1892. 



Stromata gregarious, subseriate, erumpent-superficial, black (when 

 mature), 2-3 mm. diam., at first hemispherical, then with the thin 

 margin slightly raised from the bark so as to become subdiscoid, with 

 quite a resemblance (outwardly) to Hypocrea Schweintzii Fr. 

 Ostiola papilliform, at length often umbilicately collapsing. Sporidia 

 oblong, straight or slightly curved, pale brown, 2-nucleate, 8-11 

 (mostly 8-10) x3-3?//. The specc. were old and the asci had dis- 

 appeared. 



Tryblidium Ohiense E. & E. 



On rotten wood, Ohio. (Morgan.) 



Perithecia gregarious, oblong or oblong-elliptical, l-l£x£— I mm. 

 straight or slightly curved, black, roughish, with 1-2 deep longi- 

 tudinal strise on each side of the loosely closed lips, ends sub- acute 

 or obtuse. Asci cylindrical, subsessile, densely paraphysate, 75-80 

 x 8-10//, 8-spored. Sporidia uniseriate, oblong-elliptical, unisep- 

 tate, hyaline at first, becoming brown, 12-15x4-5/-/.. 



This would come under Mytilidion, but the perithecia are flattened 

 above and the lips separated by a deep cleft. 



