252 



altered substance of the bark. Asci clavate-cyHndrieal, witli a shor 

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

 moiiostichous. ovate-oblong, and rounded at the apex, subaeute below. 

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



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

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

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

 16 /JL long, borne on filiform, simple hyphae 40-60x4 a. 



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

 destructive. 



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

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

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

 (Pers.), which is a genuine DotMdea. The former are liei'e included 

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

 Grev. XV, p. 84. 



MONTAGNELLA, S 



Fungi Arg. Pugill. IV, p. 70. 



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

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

 tate and yellowish or brownish. 



*/ 



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



Dothidea Heliopsidis, Schw. Sj-n, Car. No. 69. 

 Kxsicc. EH- N. A. F. 682. 



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

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



/ 



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, 28-30x4-5 /*, 

 yellowish-hyaline. 



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

 Hdi-opsis, Carolina (Schweinitz). 



M. platyplaca, (Berk.) 



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

 Montagnella platyplaca, Sacc. S} r ll. 5332. 



Stroma thin, black, penetrating the matrix, shining above, opake 

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

 Grey. XIII, p. TO) 1-3-septate, becoming brownish. 

 On leaves. Nicaragua. 



