273 



brown below. Perithecia minute, black, epiphyllous, scattered or 

 collected in small groups, piercing the whitened epidermis. Asci ob- 

 ' long, somewhat narrowed above, 42-125 ft long. Sporidia crowded, 

 narrow, hyaline, uniseptate, 12-15x3f p. 



On dead leaves of Arbutus Menziesii and Umbellularia, Cali- 

 fornia. 



S. cercidicola, E. & K. Bull. Torr. Bot. Club, XI, p. 123. 



Perithecia scattered, erumpent, 100 ft diani., mostly on the upper 

 side of the leaves, at length broadly perforated above. Asci oblong- 

 cylindrical, 35 x 5 ft. Sporidia closely packed, overlapping and sub- 

 biseriate, oblong-pyriform, uniseptate, H-13 x 2J-3 ft, slightly curved 

 and constricted. 



On fallen leaves of Cercis Canadensis, Kansas. 



This seems distinct from S. Cercidis, Pass, in its smaller sporidia. 



S. nyssicola, Cke. Hedw. 1868, p. 40, and Journ. Bot. March, 1883. 



(sec. Cke.) Asterina erysiphoid.es, B. & C. in Herb. Berk., at least in part 

 Exsicc. Rav. F. Am. 96. 



Hypophyllous. Perithecia very numerous, semiimmersed, brown, 

 punctiform. Asci clavate, 20-25 /j. long. Sporidia uniseptate, 8x2| ft. 

 On leaves of Nyssa multiflora, Carolina and Florida, 



S. ininntissima, Pk. 40th Rep. p. 68. 



Perithecia very numerous, occupying the whole lower surface of 

 the leaf, very minute, 50-55 ft diam., veiled by the epidermis, black. 

 Asci oblong or slightly narrowed towards the apex, 40-50 x 8-10 ft. 

 Sporidia crowded, oblong, straight, obscurely-septate in the middle. 

 15-171 x 4 ju. 



On dead leaves of Alnus incana, Adirondack Mts., N. Y. 



The perithecia are scarcely visible to the naked eye. The affect- 

 ed leaves remain on the branches all winter. 



S. alnicola, Pk. 1. c. 



Perithecia small (80-105 ft), hypophyllous, clustered or scattered, 

 naked, black. Asci oblong or subclavate, 50-62 x 13-15 //. Sporidia 

 crowded, lanceolate, uniseptate, often slightly curved, 23-28 x 4J ft. 



On dead leaves of Alnus viridis, Mt. Marcy, N. Y. 



The sporidia are narrowed towards one end and septate in the 

 middle. 



S. polifolia, E. & E. Proc. Acad. Nat. Sci. Phil. July. 1890, p. 231. 



Perithecia epiphyllous on grayish-black, indefinite spots 2 mm. or 

 35 



