Dermea 361 



Cenangium Prunastri Fries, Syst. Myc. 2: 180. 1822. 

 Cenangium Prunastri rigida Fries, Syst. Myc. 2: 180. 1822. 

 ? Cenangium rigidum Schw. Trans. Am. Phil. Soc. II. 4: 238. 1832. 

 Tympanis Prunastri Wallr. Fl. Crypt. Germ. 2: 427. 1833. 

 Sphaeronema spurium Sacc. Syll. Fung. 3: 186. 1884. 

 Phaeangella Prunastri Massee, Brit. Fungus-Fl. 4: 137. 1895. 

 Dermatella Prunastri Dowson, New Phytologist 12: 207. 1913. 



Conidial bodies erumpent, occasionally single, more often 

 cespitose, cylindric, or cylindric-conic to subulate, 1-2 mm. in 

 height, .2-. 4 mm. in diameter at the base, arising from a more or 

 less circular, or transversely elongated basal stroma, black to 

 greenish, or olivaceous when moist, hard, horny, brittle, softer 

 when moist, with a single, ovoid cavity which is frequently in the 

 tip of the beak only but may extend into the basal stroma also; 

 conidiophores hyaline, cylindric, tapering to a slender point, 

 simple, 2.5-3 X 20-35 m; conidia elongate-fusiform, hyaline, 

 slightly greenish, simple, almost straight, or slightly sickle- 

 shaped, the ends acute, 5-7 X 20 35 /x; microconidia hyaline to 

 yellowish, filiform, straight, or slightly curved, simple, ends 

 rounded, 1.5 X 7-10 m- 



Apothecia erumpent, single, or cespitose, sessile, narrowed 

 below, circular, or undulated, .5-1 mm. in diameter .2-1 mm. 

 high, dark-brown to black, leathery to horny, fleshy when moist; 

 hymenium concave to plane, or slightly convex, black; asci 

 cylindric-clavate, short-stalked, 8-spored, reaching a length of 

 90-125 /i and a diameter of 12-15 yu; spores ellipsoid-fusiform, 

 hyaline, becoming yellowish, simple, or 1-3-septate, straight, or 

 slightly curved, irregularly 2-seriate, 5-7.5 X 15-25 ^t; paraphy- 

 ses hyaline, filiform, simple, or branched, 1.5-2 (x in diameter, 

 the tips swollen to 2.5-3 jjl and glued together forming a yel- 

 lowish epithecium. 



On various species of Prunus. 



Type locality: Europe. 



Distribution: New Hampshire to Washington and South 

 Carolina. 



Illustrations: Phill. Brit. Discom. pi. 10, f. 66; New 

 Phytologist 12: 209,/. i, 2; 211,/. 3; Mycologia 38: 366,/. 5, 6; 

 383,/. 28, 395;/. 43. 



ExsiCCATi: Ellis & Ev. Fungi Columb. 3118 (as Dermatea 

 Cerasi) . 



