608 



Stromata epiphyllous, scattered or approximate, or even confluent, 

 numerous, often thickly scattered over the entire upper surface of the 

 leaf, flattish-pulvinate, or depressed-hemispherical, suborbicular in out- 

 line, black, but covered by the thin, gray epidermis, verrucose from 

 the projecting apices of the cells, about 1 mm. broad. Asci cylin- 

 drical, subsessile, 60-70 x 8-9 fju Sporidia obliquely uniseriate, 

 obovate-elliptical, greenish-hyaline, continuous at first, but when 

 mature, with a single transverse septum near the base, 10-11 x 5 p. 



On fallen leaves of Ulmus. 



Sent to Schweinitz by Dr. Torrey, from New York State. We 

 do not find any other reference to this species as being found in this 

 country, and we have seen no American specc. 



D. lilmea, (Schw.) 



Sph&ria ulmea, Schw. Syn. Car. No. 288, Fr. S. M. II, p. 436. 

 Fxsicc. F41. N. A. F. 1347. Rav. F. Am. 752. Rav. Car. II, 67. 



Perithecia buried in the parenchyma of the leaf either singly or 

 2-8 together, stromatically connected, their bases projecting and form- 

 ing little tuberculiform heaps on the upper surface of the leaf, and 

 their papilliform ostiola erumpent through the ruptured epidermis 

 on the lower side. Asci oblong-cylindrical, 55-60 x 8 //, subsessile, 

 8-spored. Sporidia subbiseriate, hyaline, ovate, 7-9 x 3-3| p, finally 

 with a septum near the lower end. 



On leaves of Ulmus, common. 



Found mature only after the leaves have lain on the ground 

 through the winter. This must not be confounded with D. Ulmi, 

 (Duv.), which, though having sporidia almost the same as this (only a 

 little larger), differs essentially in its other characters. This (D. ulmea) 

 is anomalous on account of the ascigerous cells assuming the character 

 of perithecia as in Homostegia Kelseyi. 



D. sphaeroidea, (Cke.) 



Dothidea Sphceroidea , Cke. Grev. VII, p. 50. 

 Fxsicc. Rav. F. Am. 387. 



Stromata scattered, solitary, superficial, 350-400 p diam., hemi- 

 spherical, rough, black. Ascigerous cells immersed in the stroma, not 

 crowded, about 30 in number, subglobose, 100-150 p diam. Ostiola 

 papillose-prominent, roughening the surface of the stroma. Asci ob- 

 ovate, 72-80x30-40 p, sessile. Paraphyses branched, thickened at 

 their tips. Sporidia crowded, obovate, unequally uniseptate, 24-28 x 

 20 p diam., upper cell of the sporidia globose, 20 p diam., lower cell 

 subglobose, 10-12 p diam., hyaline, becoming yellow-brown. 



