611 



Stromata gregarious, mostly numerous, often several standing- 

 near each other, but not often confluent, orbicular or elongated, erum- 

 pent and strongly prominent, flat-pulvinate, black, at first smooth, 

 finally shrunken and wrinkled, ^-1 mm. diam. Cells very numerous, 

 crowded and small. Asci oblong-cylindrical, attenuated below, 8- 

 spored, 78-96x14-16 jm. Sporidia obliquely uniseriate or partly bi- 

 seriate, oblong-subclavate, uniseptate, the lower cell smaller, olive- 

 brown, 19-21 x 8-9 p. 



On dead limbs of Morus Multicaulis, Carolina, on dead stems of 

 Sambucus Canadensis, New York State (Peck). 



D. Montaniensis, E. & E. (Plate 40) 



Dothidea Bigelovice, E- & E. Proc. Acad. Nat. Sci. Phil. July, 1890, p. 248. 



Stromata depressed-tubercular, suborbicular, about 1 mm. diam., 

 smooth and black, gregarious, partly sunk in the bark of the dead 

 stems. Ascigerous cavities peripheric, minute, numerous. Asci ob- 

 ; long, 40-50 x 12 ji, soon disappearing. Sporidia subbiseriate, unisep- 

 tate, constricted at the septum, 15-20x7-10 p.. 



On dead stems of Bigeloviaf Helena, Montana (Kelsey, No. 141). 



D. ribesia, (Pers.) 



Sphczria ribesia, Pers. in Usteri N. Ann. d. Bot. V, p. 24. 



Dothidea ribesia, Fr. S. M. II, p. 550. 



Plowrightii ribesia, Sacc. Syll. II, p. 635. 

 Exsicc. Fckl. F. Rh. 1005. Kze. F. Sel. 157. Rab. Herb. Mycol. 655. Desm. PI. Cr. Ed. 

 I, 283, Ed. II, 835. RehmAsc. 517. Kriegr. F. Sax. 583. Roum. F. Gall. 293. Linht. 

 F. Hung. 66. Sydow, M. March. 1300, 2158. EH. N. A. F. 483. 



Stromata scattered or gregarious, sometimes crowded in small, 

 dense clusters or groups, mostly transversely erumpent and surrounded 

 by the ruptured epidermis, round or elliptical, or more or less irregu- 

 lar, mostly flat or depressed above, often grooved, black, lusterless. 

 1-3 mm. broad. Perithecia (cells) scarcely crowded, subglobose, per- 

 forated above, finally slightly prominent so that the surface of the 

 stroma appears uneven. Asci oblong-cylindrical, stipitate, 8-spored, 

 75-90x10//. Sporidia oblique or biseriate, oblong-fusoid, divided 

 unequally by the single septum, slightly constricted, hyaline, 15-22 x 

 5-6 li. 



On dead stems of various species of Ribes, common. 



D. Mezerei, Fr. S. M. II, p. 551. 



Plowrightia Mezerei, Sacc. Syll. 5287. 

 Exsicc. Fckl. F. Rh. 1818. Rab. F. E. 1845 Rehm. Asc. 371. 



Stromata gregarious, often very numerous and thickly scattered. 



