539 



without any 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 [i. Spo- 

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

 subinequilateral, often a little curved, 2' (sometimes 3-) septate, not 

 constricted, brown, 25-35 x 12-14 jji, with a short, thick, hyaline 

 appendage at each end. 



On dead limbs of Platanus occidentalis, New York (Peck). 



Ps. bic<5rnis, (Cke.) 



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

 Pseudovalsa bicornis, Sacc. Syl. 3364, Cke. Syn. 211a 



Perithecia circinating, 6-7, 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 n 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 occidentalis, New York State (Peck). 



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

 dermis is torn away, the peiithecia come off with it They arc slightly 

 whitish-floccose or tomentose above. 



Ps. sambiieina, (Pk.) 



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



Pseudovalsa sambucina, Sacc. Syll. 3356, Cke. Syn. 5103. 



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 ^ long. 



On dead stems or branches of Sambucios, Oatskill Mts., 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 



