589 



D. Populi, Ell. & Hoi. Journ. Mycol. I, p. 4. 



Perithecia cartilaginous, ovate or subangular from mutual com- 

 pression (J-| mm.), closely packed in an orbicular, lens-shaped stroma 

 2-3 mm. diam., dark brown outside, dirty-white within, and seated on 

 the surface of the inner bark. Ostiola short, stout, tips obscurely 

 4-cleft and united in an obscure black disk or piercing the epidermis 

 separately. Asci long-clavate, 100-115 x 15 p. Sporidia cylindrical, 

 yellowish, curved, 10-12 x l-2 //. The surface of the wood is black- 

 ened except directly under the stroma, where it retains its light color. 



On dead limbs of Populus, Iowa (Hoi way). 



D. decipiens, E. & E. Journ. Mycol. IV, p. 80. 



Stroma erumpent, black (lighter colored at first), orbicular or ob- 

 long, 2-6 mm. across, pulvinate, convex or, in .the larger specimens, 

 almost plane, whitish inside, with a black, circumscribing line around 

 the base. Ostiola slightly prominent, quadrisulcate, situated in slight 

 depressions. Perithecia monostichous, oblong-ovate, about | mm. long, 

 contracted abruptly into a short neck above. Asci (p. sp.) 50-70 x 

 6-7 //, polVsporous. Sporidia yellowish, allantoid, moderately curved, 

 3J 4j ( or exceptionally 5 p. long) and less than 1 fi thick. This can 

 not be distinguished by its external characters from Diatrype bullata. 

 (Hoff.), but internally it is very different. 



On bark of Umbellularia Calif omica, Oregon (Carpenter) 



1). hysterioides, E. & E. Journ. Mycol. II, p. 99. 



Exsicc. EH. & Evrht, N. A F. 2d Ser. 1790. 



Stroma erumpent, tuberculiform, prismatic, often deeply quadri- 

 sulcate and subcornute, |-1 mm. diam., yellow inside (about the same 

 shade of yellow as in Hypoxylon sassafras, Schw.), often elongated, 

 hysteriiform (1 J 2 mm. long), with a longitudinal furrow above like a 

 Hysterium. Perithecia 2-6 in a stroma, J-J mm. diam., with thick, 

 black, coriaceous walls, narrowed above into a short neck, the apex of 

 which is visible on the surface of the stroma as a small, papilliform or 

 sometimes conical ostiolum. Asci ckvate-cylindrical, with a slender 

 base, 100-115x10-12// (p. sp. 75-80//), filled with a multitude of 

 allantoid, yellowish, 2-nucleate, 6-7 xl| // sporidia. The Bpeci< 

 well characterized by its peculiar stroma. The color of the young 

 stroma is much deeper, orange-red, but the color finally disappears. 



On a decorticated poplar limb, in a willow jungle, Louisiana 

 (Langlois). 



