252 



altered substance of the bark. Asci clavate-cylindrical, with a short 

 stipe, 8-spored, paraphysate, 120x18-20 [i. Sporidia obliquely 

 monostichous, ovate-oblong, and rounded at the apex, subacute below, 

 uniseptate, the lower cell narrower, hyaline, 16-20x8-10 ji. 



Stylospores in similar perithecia, ovoid, 3-septate, yellowish, stipi- 

 tate, 12x6 fi. Spermatia minute on slender basidia. Conidia 

 produced on the surface of the young stroma, ovoid subolivaceoiis, 

 16 // long, borne on filiform, simple hyphas 40-60x4 /i. 



Common on limbs of plum and cherry trees, to which it is very 

 desti'uctive. 



The genus Plowrightia, in Sacc. Syll., is unsatisfactory, embra- 

 cing species with true perithecia, such as Sphoeria morbosa, Schw., 

 and others with mere ascigerous cells, such as Dothidea ribesia, 

 (Pers.), which is a genuine Dothidea. The former are here, included 

 in the subgenus Otthiella, as has already been done by Cooke in 

 Grev. XV, p. 84. 



MONTAGNELLA, Speg. 



Fungi Arg. Pugill. IV, p. 70. 



Perithecia densely gregarious, on an effused stroma, free above, 

 adnate below. Asci 8-spored, subcylindrical. Sporidia finally 3-sep- 

 tate and yellowish or brownish. 



M. Heliipsidis, (Schw.) (Plate 41) 



Dothidea Heliopsidis, Schw. Syn, Car. No. 69. 

 Exsicc. Ell. N. A. F. 682. 



Perithecia depressed-globose, black (white within), connected at 

 the base by a stromatic crust surrounding the stem on which it grows 

 and extending longitudinally for 1 cm. or more. Asci cylindrical, 

 short-stipitate, 90-100x8-10 //. Sporidia obliquely uniseriate or 

 biseriate, fusoid-oblong, frequently curved, 3-septate, 28-30x^5 //, 

 yellowish-hyaline. 



On dead stems of Helianthus divaricatus? Newfield, N. J., on 

 Meliopsis, Carolina (Schweinitz). 



M. plattplaca, (Berk.) 



Dothidea platyplaca^ Berk. & Curt, in N. Pac. Expl. Exp. p. 129, No. 163. 

 Montagnella plaiyplaca, Sacc. Syll. 5332. 



Sti'oma thin, black, penetrating the matrix, shining above, opake 

 and fertile below, perithecia (cells) ? superficial. Sporidia (sec. Cke. 

 Grev. XIII, p. 70) 1-3-septate, becoming brownish. 

 On leaves, Nicaragua. 



