592 



walls thick, black, coriaceous, necks short. Asci fusoid, 110-115 

 (p. sp. 75-80) x8-10 /*, polysporous, stipitate, paraphysate. Sporidia 

 allantoid, yellowish-hyaline, not strongly curved, 6-9 x 1J /*. 

 On dead stems of Gephalanthus occidentalism common. 



D. spissa, (Schw.) 



Sphceria spissa, Schw. Syn. N. Am. 1253. 



Crowded in longitudinal cracks in the wood, forming narrow 

 - strips often half an inch long, acuminate at each end. and becoming 

 black, considerably elevated in the middle, surface very rough from 

 the prominent perithecia. Stroma scarcely any. Perithecia (J-| mm. 

 diam.), immersed in the wood itself. Ostiola prominent, subcorneal. 

 Asci (p. sp.) 45-55 x 10-12 fi. Sporidia hyaline, slightly curved, 

 5xl|//. 



On dry oak wood, Bethlehem, Pa. (Schw.). (Measurements from 

 spec, in Herb. Schw.). 



D. variolosa, (Schw.) 



Sphceria variolosa, Schw. Syn. N. Am. 1272. 



Stromata pulvinate, erumpent, about 2 mm. diam., flattish, sub- 

 confluent, closely embraced by and partly covered with fragments of 

 the ruptured epidermis, black, rugose. Ostiola numerous, short, quadri- 

 plicate. Perithecia obovate or pyriform, rather large, polystichous, 

 immersed in the white substance of the stroma. Asci clavate-cylin- 

 drical, 75-80x12-15 //, with abundant paraphyses. Sporidia yel- 

 lowish-hyaline, allantoid only slightly curved, with a nucleus in each 

 end, 5-6 x 1 \ //. 



On young branches of Populus Italica, Bethlehem, Pa. 



D. prominens, (Howe). 



Diatrype prominens, Howe, Bull. Torr. Bot. Club, V, p. 42. 



Stroma wart-like, orbicular or angular, 1-1 \ mm. diam., erum- 

 pent and closely girt by the ruptured epidermis, subprominent, black 

 outside, whitish within. Perithecia 4-8 in a stroma, subglobose, about 

 J mm. diam. necks short, with their ostiola obtusely conical, slightly 

 prominent and finally broadly and irregularly perforated. Asci clav- 

 ate-stipitate, 75-80 (p. sp. 55-60) x 10-12 fi, paraphysate, polyspo- 

 rous. Sporidia allantoid, yellowish-hyaline, moderately curved, 6-8 x 



On bark of dead Platanus, New York and California. 

 The diagnosis is from New York specc. from Peck. Diatrype 

 prominens, Cke. & Hark, is distinct from this, having 8-spored asci. 



