574 



black, crowded in the tubercles, surrounded, when fresh, with a white 

 stroiua. Ostiola polygonal, prominent, at length irregular, deeply 

 umbilicate. Very variable in shape as it is found on the wood or on 

 the bark. Tubercles 4-6 nun. high, in elongated series of several 

 inches in extent. Sporidia (Cke. 1. c.) 8 // long, allantoid. 



On dead steins of Sambucus Canadensis, Bethlehem, Pa. (Schw.). 



Allied to Sphceria scabrosa. 



9 



D. microstega, E. & E. (in Herb.) 



Stroinata gregarious, small, J-l mm. diani., erumpent, superficial. 

 black, rough, subglobose. Perithecia 1-5 in a stroma, small, black. 

 Ostiola prominent, subpyraniidal, and more or less stellate-cleft. Asci 

 (p. sp.) 35-40 x 6-7 p. Sporidia subbiseriate, allantoid, yellowish, 

 slightly curved, 10-12 x 1J-2 . 



On bark, California (Harkness). Sent as Sphceria submoriformis, 

 Plowr. 



D. Macoimii, E. & E. Proc. Acacl. Nat. Sci. Phil. July, 1 890, p. 224. 



Stroma discoid, gray, 3-4 mm. across, and about 1 mm. thick, sub- 

 orbicular or subelliptical, seated on the surface of the inner bark, and 

 loosely embraced by the upturned, ruptured epidermis, circumscribed 

 by a distinct, black line, which penetrates the bark and stains the sur- 

 face of the subjacent wood, but does not penetrate it. Perithecia 

 numerous, 30-50, in a single layer, ovate-globose, J-J mm. diam.^, con- 

 tracted above into short necks terminating in a small, indistinctly 

 radiate-cleft, black ostiolum, which is in a slight depression of the 

 stroma. Asci (p. sp.) 20-30 x 3 // or, including the thread-like base. 

 50-60 p. long. Sporidia biseriate above, allantoid, slightly curved, 

 4-6 x f-1 p. Substance of the stroma dirty white inside. 



On maple bark (Acer rubrum)t, Agassiz, British Columbia 

 (Macoun). 



D. Hochelagse, E. & E. Proc. Acad. Nat. Sci. Phil. July, 1890, p. 

 224. (Plate 34) 



Exsicc. EH. & Evrht. N. A. F. 2d Ser. 2528. 



Stroma orbicular or elongated, 2-3 mm. long and 1-2 mm. wide, 

 often more or less confluent, pulvinate-verrucose, with the margin 

 abrupt or slanting off at the ends, with a faint circumscribing black 

 line, which does not penetrate deeply into the wood, dull black outside. 

 dirty white within. Perithecia crowded in the stroma, subglobose. 

 about | mm. diam., with thick, black, coriaceous walls. Ostiola conic- 



