539 



without an}- distinct stroma, with converging, short-cylindrical necks 

 bent upwards at their extremities and just visible through short, 

 narrow cracks in the epidermis, but not exserted. Asci elliptical or 

 oblong-elliptical, with a short stipe, 8-spored, 90-105 x 35-40 //. Spo- 

 ridia conglomerate, oblong or oblong-cylindrical, ends broadly rounded, 

 subinequilateral, often a little cur.ved, 2- (sometimes 3-) septate, not 

 constricted, brown, 25-35x12-14 /u, with a short, thick, hyaline 

 appendage at each end. 



On dead limbs of Platanus occidentalism New York (Peck). 



Ps. bicornis, (Cke.) 



Melanconis bicornis, Cke. in 28th Rep. N. Y. State Mus. p. 72, 

 Pseudovalsa bicornis, Sacc. Syl. 3364, Cke. Syn. 2110. 



Perithecia circulating, 5-7, seated beneath the epidermis which 

 is but slightly raised. Ostiola short, convergent, just piercing the epi- 

 dermis, with a regular orifice. Sporidia expelled when mature, black- 

 ening the matrix around the ostiola, fasciculate, obtusely fusiform, 

 triseptate, straight or curved, brown, 63-78 [i long, scarcely con- 

 stricted, end cells smallest, each extremity tapering into a hyaline, at 

 first straight, then curved or flexuous, horn-shaped appendage one-half 

 to one-third the length of the sporidium. 



On bark of Platanus occidentalism New York State (Peck). 



Allied to Ps. haplocystis, (B. <fc* Br.), but distinct. When the epi- 

 dermis is torn away, the perithecia come off with it. They are slightly 

 whitish-floccose or tomentose above. 



Ps. sanibiicina, (Pk.) 



Valsa sambucina, Pk. 28th Rep. p. 75. 



Pseudovalsa sambucina, Sacc. Syll. 3356, Cke. S3'ii. 2103. 



Pustules erumpent, sometimes seriately placed. Ostiola slightly 

 prominent, even or radiately sulcate, scattered or crowded, Asci lin- 

 ear. Sporidia 8, uniseriate, oblong, colored, triseptate, 12-15 jut long. 



On dead stems or branches of Sambucus, Catskill ftfts., N. Y. 

 (Peck). 



When young, the sporidia are paler. The pustules vary much in 

 size; those on the branches being larger and more scattered than 

 those on the main stems and trunks. 



Ps. stylospora, E. & E. Proc. Acad. Nat. Sci Phil. Pa., July, 1890, 

 p. 223. (Plate 35) 



Stroma cortical, convex, 2-3 mm. diam., covered by the epidermis. 

 Perithecia circinate, 4-8 in a stroma, globose, | mm. diam., collapsing 



