434 



is not discolored, though rendered more compact and surrounded by a 

 thin, black layer which penetrates the wood beneath. Ostiola short- 

 cylindrical, thick, stout, obtuse, with an irregular opening. Asci 

 broad-lanceolate; sessile, 75 x 15 fi. Sporidia biseriate, oblong-ellip- 

 tical, uniseptate and slightly constricted, hyaline, 12 x 5-6 //, with two 

 large nuclei, at length easily separating in the midddle. 



On dead limbs of Amelanchier Canadensis, Newfield, N. J., and 

 on dead maple limbs, London, Canada (Dearriess). 



When the bark decays and falls away, the black, tuberculiform 

 stroma remains attached to the wood and then, much resembles the 

 stroma of some Diatrype; this at least is the case with the specc. on 

 Amelanchier. 



D. Ampelopsidis, (Ell.) 



l^alsa Ampelopsidts, Ell. Bull. Torr. Bot. Club, IX, p. 112. 

 Cryptosporella Ampelopsidis, Sacc. Syll. 6025. 

 Valsa {Crypiosporella) Ampelopsidis, Cke. Syn. 1940. 

 Exsicc. Ell. N. A. F. 881. 



Perithecia subcircinate, few, seated on the surface of the wood 

 and enveloped in the bark without any distinct stroma. Ostiola cylin- 

 drical, subacute, their tips united in an elliptical, plane disk erumpent 

 through longitudinal fissures in the bark, but at length obliterated. 

 Asci clavate-cylindrical, about 70 x 12 //. Sporidia biseriate, oblong- 

 elliptical, subacute, hyaline, 1-4-nucleate, becoming uniseptate, 18-22 

 x7^//. 



On dead stems of Awpelopsis quinquefolia, Newfield, N. J. 



D. apocrf pta, (C. & E.) 



Valsa apocrypta, C. & E. Grev. VIII, p. 15. 

 Diaporihe apocrypta, Sacc. Syll. 2409. 



Perithecia in groups of 3-8, subcircinate in the unchanged inner 

 bark, \-\ mm. diam., their short, obtuse, subfasciculate ostiola raising 

 the epidermis into slight pustules which are finally ruptured, but the 

 ostiola are not exserted. Asci clavate-cylindrical, 75-80 -x 15-18 //. 

 Sporidia biseriate, oblong, uniseptate and constricted, obtuse, hyaline, 

 18-20 x 6 /i (25-28x8-9 /i, Cke.). The groups of perithecia are 

 thickly scattered through the bark, more or less irregularly disposed, 

 often contiguous or confluent, and scarcely visible externally. 



On decaying hickory limbs, Newfield, N. J. 



D, corymbosa, (C. & E.) 



Valsa corymbosa, C. & K. Grev. VIII, p. 15. 

 Diaporihe corymbosa, Sacc. Syll. 2412. 



Perithecia immersed in the wbod, in an elliptical (2-3 x 1-2 fi) 



