587 



stroma, closely packed, monostichous, ovate or angular, about J nim. 

 cliam., with short necks terminating in the depressed-hemispherical, 

 sometimes obscurely radiate cleft, and finally broadly and irregularly 

 perforated and collapsing ostiola. Asci about 80 x 8 //, narrow-clavate, 

 polysporous, stipitate. Sporidia 40-50 in an ascus, yellow in the mass. 

 nearly hyaline when seen singly, not strongly curved. 5-6 x 1 //. 



On dead stems of Corylus, Missouri (Demetrio). 



This has the general appearance of Diatrype albopruinosa. 



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



Stromata scattered, pustuliform, small (1-2 mm.), apex erumpent, 

 black, lower part buried in the bark, faintly circumscribed, white in- 

 side. Perithecia monostichous, 5-15 in a stroma, J mm. diain., with 

 black, coriaceous walls, sunk to the bottom of the stroma, necks short. 

 Ostiola only slightly prominent, convex, broadly and irregularly de- 

 hiscent. Asci clavate, 110-120 x 10-12 JUL. Sporidia numerous, inor- 

 dinate, yellowish in the mass, nearly hyaline when free, slightly curved, 

 obtuse, 6-7 x 1 J-2 //. 



On dead twigs of orange trees, Florida (Underwood). 



D. discoidea, ke. & Pk. 28th Rep. p. 71. 



Exsicc. Thuin. M. U. 864. Ell. N. A. F. 492. Rav. F. Am. 188. 



Stroma orbicular or elliptical, transversely erumpent, surrounded 

 by the epidermis, disk naked, plane, grayish-black. Ostiola small, 

 scarcely exserted, nearly smooth or 4-6-sulcate. Perithecia monos- 

 tichous, ovate, 6-12, or in the larger stromata 20-40, small. Asci 

 polysporous, paraphysate. Sporidia allantoid, nearly straight, 5-6 

 x f-1 p.. When the outer bark is torn off the stroma and perithecia 

 come with it. There are two forms, one with the stroma narrow, and 

 transversely erumpent, the other with the stroma orbicular. Var. 

 Aim, Cke,, has the stroma orbicular and superficial or nearly so. 



On bark of dead birch trees, Northern U. S. and Canada: the 

 var. on alder, in South Carolina and California, 



D. opaca, Cke. Texas Fungi, Xo. 113. 



Stromata scattered, tuberculiform, about 1^-2 mm. diam., erum- 

 pent-superficial, rufous-brown, becoming black, very white inside, 

 sometimes subconfluent, Perithecia 3-8 in a stroma, about | mm. 

 diam. Asci clavate. p. sp. 75-90 x 12-15 //, polysporous, paraphysate. 

 Sporidia allantoid, crowded, moderately curved, yellowish-hyaline, 

 6-8 x 1| //. 



On dead limbs of Ilex opaca, Texas (Ravenel), Florida (Calkins). 



