Dermea 359 



8. Dermea acerina (Peck) Rehm, Ber. Bayer. Bot. Ges. 13: 197. 

 1912. 



Sphaeronema acerinum Peck, Ann. Rep. N. Y. State Mus. 24: 86. 1872. 



Sphaeronema nigripes Ellis, Bull. Torre.v Club 6: 107. 1876. 



Tympanis acerina Peck, Ann. Rep. N. Y. State Mus. 31: 48. 1879. 



Scleroderris acerina Sacc. Syll. Fung. 8: 599. 1889. 



?Lecanidion acericolum Atk.; Peck, Ann. Rep. N. Y. State Mus. 49: 24. 1896. 



?Patellaria acericola Atk.; Butler, M>cologia 32: 810. 1940. 



Conidial bodies erumpent, single, or cespitose in small clusters, 

 or more often in long rows, subulate, basal stroma subglobose to 

 ovoid .2-.5 mm. in diameter, dark-brown to black, leathery to 

 horny, softer when moist, the beak slender, tapering, straight, 

 or curved, reaching a length of 1.5 mm. and 100-150 ^ in diam- 

 eter at the base, paler and sometimes translucent toward the 

 tip; conidiophores hyaline, cylindric, simple, 2 X 20-40 m. 

 swollen below the point of attachment; conidia ellipsoid, hyaline, 

 straight, or sometimes slightly curved, one end with a truncate 

 apiculus, 5-8 X 15-25 /x; microconidia hyaline, filiform, simple, 

 straight, or curved, 1-2 X 6-10 /jl. 



Apothecia erumpent, single, or in rows, circular, or undulate, 

 .4-1 mm. in diameter, .2-. 5 mm. high, sessile, narrowed below, 

 black, or dark-brownish, leathery to horny, softer when moist; 

 hymenium at first concave, becoming plane, or slightly convex, 

 slightly paler than the outside of the apothecium; asci cylindric- 

 clavate, short-stalked, 8-spored, reaching a length of 85-125 ^u 

 and a diameter of 13-16 /j.; spores ellipsoid-fusiform, hyaline, 

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

 slightly curved, irregularly 2-seriate, 5-6 X 13 20 fx; paraphyses 

 hyaline, filiform, simple, or branched, 1.5-2 n in diameter, the 

 tips slightly swollen and glued together forming a yellowish 

 epithecium. 



On various species of Acer, A. Saccharum, A. saccharinum, A. 

 ruhrum. 



Type locality: Greenbush, New York. 



Distribution: New York to Michigan and Virginia. 



Illustrations: Mycologia 38: 379,/. 16; 386,/. 36; 398,/. 50. 



ExsiccATi: Ellis, N. Am. Fungi 947; Ellis & Ev. Fungi 

 Columb. 2086, 3585; Reliq. Farlow. 143a, b. 



