623 



On bark, Ottawa, Canada (Macoun), on bark and wood, Topeka, 

 Kans. (Cragin), and on bark of Ulmus Americana, Missouri (Dem- 

 etrio). Found in Europe on branches and trunks of Sorbns aucuparia. 



N. subconcava, (Schw.) 



Sphceria subconcava, Schw. Syn. N. Am. 1251. 



Gregarious and often confluent, erumpent, \-\ cm. across, sur- 

 rounded by the ruptured epidermis, and consisting of a black, crusta- 

 ceous shell, inclosing the few, .'rather large, globose-depressed perithecia, 

 connected by a very scanty stroma. Disk subconcave, subrugose and 

 black. Ostioia globose-papillate, elevated, few, black, sometimes con- 

 fluent, connected by a very short neck with the perithecia, which have 

 the ascigerous nucleus white. Sporidia (sec. Stevenson) oblong, light 

 brown, 151 9 x 5f 7 J jut, some of them slightly constricted in the mid- 

 dle, but not septate. 



On branches of Viburnum dentatum, Bethlehem, Pa. (Sehweinitz). 

 N. succenturiata, (Tode). 



SphcBria succenturiata, Tode Fungi, Meckl. II, p. 37. 

 Hypoxylon succenturiatum, Fr. Sumtna Veg. Scand. p. 383. 

 Nummularia succenturiata, Nits. Pyr. Germ. p. 58. 



Stroma at first erumpent through the closely adherent epidermis: 

 finally, after the bark has fallen away, superficial, seated on the wood 

 and surrounded by a black, circumscribing line, 2 cm. or more long, 

 either elongated, elliptical or orbicular at base, pulvinate, thick and 

 flattened above, or subconstricted at the base, with the orbicular disk 

 slightly concave, dark brown and rugose-corrugated outside, dark 

 gray, becoming black within. Perithecia irregularly distichous or 

 sometimes monostichous, ovate or oblong, often compressed, tolerably 

 large, with very thick, firm walls, subcrect, entirely sunk in the stroma, 

 with necks more or less elongated according to their position, and 

 small, not projecting, perforated ostioia. Asci cylindrical, sessile. 

 8-spored, 120x8-9 ju, with filiform paraphyses. Sporidia obliquely 

 uniseriate, fusoid, or ovoid, obtuse at the ends, straight or subinequi- 

 lateral, brown, 16-18 x5-7 /i. 



On branches, Bethlehem, Pa. (Schw.); rather rare. 



The stroma varies in size, 6-9 mm. long by 4-6 mm. broad, or 

 sometimes not more than 2 mm. broad, 2J-3 mill, thick, pulvinate and 

 flat or concave above. The above diagnosis is from Winter's Pilze. 



