601 

 *## Q n Acotytedonoits plants. 

 Ph. Pteridis, (Reb.) 



Sph&ria Pteridis, Reb. Neom. p. 314, tab. I, fig. 3. 

 Dothidea Pteridis, Fr. S. M. II, p. 555. 

 Phyllachora Pteridis, Fckl. Symb. p. 218. 

 Rhopographus Pteridis, Winter Die Pilze, II, p. 915. 

 Exsiec. Thum. M. U. 175, 2176. Thum. F. Austr. 1053. Rehm Asc. 522. 5S1. Romell 

 F. Scand. 82. Erikss. F. Scand. 39. 



Stromata hypophyllous, elongated, oblong, following the nerves, 

 cinereous-black outside, deeper black within, 2-3 mm. long, -f nun. 

 wide, minutely punctate from the ostiola, Asci numerous, cylindrical. 

 8-spored, 64x14 ft. Sporidia biseriate, elliptical, hyaline, simple, 

 2-nucleate, 8-10x5-6 ft. ParaphysQS none. On fronds of Pteris 

 aquilina, common. New England to Carolina, and west to Montana. 



None of the specc. in the Exsiccati quoted nor, in fact, any we 

 have seen, are ascigerous, but those in Thum. M. U. (collected in New 

 Jersey) have clavate-oblong stylospores 12-20x 2J-3 ft. The descrip- 

 tion of the asci and sporidia is taken from Sacc. Syll. 



Ph. leptostromoidea, Cke. Grev. XIII, p. 64. 



Stroma irregular, minute, flattened, black, sometimes confluent. 

 Ostiola scarcely visible. Asci clavatc, 8-spored. Sporidia elliptical, 

 continuous, hyaline, 8 x 3 ft. 



On fronds of Pteris, South Carolina (Ravenel). Resembles a 

 Leptostroma. 



Ph. flabella, (Schw.) 



Sphceria flabella, Schw. Syn. N. Am. 1489. 

 Phyllachora flabetla, Sacc. Sj'll. 5154, Cke. Syn. 1126. 

 Exsiec. Thum. M. U. 176. Rehm Asc. 473. Rav. F. Am. 99. Ell. N. A. F. 486. 



Stromata as in Ph. Pteridis, only epiphyllous, covered by the 

 epidermis and often interrupted and tubercular. Ascigerous cells 

 rather large, white inside. Asci cylindrical, sessile, 60-90 x 8-10 ft, 

 paraphysate, 8-spored. Sporidia mostly overlapping-uniseriate, acutely 

 elliptical, or ovate-elliptical, subinequilateral, yellowish-hyaline, simple. 

 10-12x5-6 ft. 



On dead fronds of Pteris aqiiilhia, New England. New Jersey 

 and New York; probably also in other localities where its host is 

 found, but, like many other species of this genus, it is often found 

 sterile. It can, however, be easily recognized by its peculiar habit. 

 76 



