14 



Amphigenous. Mycelium abundant, persistent, haustoria of tlie 

 mycelial threads lobed. Perithecia somewhat aggregated, appendages 

 numerous, short, flexuous, colored, interwoven with the mycelium. 

 Asei numerous, often 12 or more. Sporidia 2, mostly formed late. 



On Teucrium Canadense, Mentha, Scutellaria lateriflora, S. 

 aspera, Galeopsis Tetrahit, Chelone glabra. 



Widely distributed east of the Rocky Mountains and in Montana 

 (Anderson), but not often distinguished from E. Cichoracearum in 

 published lists. It can scarcely be separated from the latter by the 

 characters of the perithecia, but the difference in the haustoria, first 

 pointed out by De Bary (Morph. und Phys. der Pilze, III, p. 49), can 

 be observed by first soaking a portion of the leaf in caustic potash and 

 then removing a little of the mycelium to the slide. The perithecia 

 and appendages are often rather lighter colored than is usual in E. 

 Ciehoracearum,. 



E. aggregata, (Peck). 



Erysiphella aggregata. Peck 28th Rep. N. Y. State Mus. Nat. Hist. p. 63. 

 Erysiphe aggregata, Farlow, Bull. Bussey Inst. II, (1878), p. 227. 



Mycelium dense, felt-like, white, but becoming yellowish, Peri- 

 thecia very numerous, closely crowded, opake, thick-walled, with 

 rather small cells, 140-180 jjl] appendages very numerous, inter- 

 woven, hyaline or nearly so, rather slender. Asci numerous, 10-50, 

 oblong-ovate or sometimes narrower, thick-walled. Sporidia crowded 

 in the ascus, oval, mostly 15-20 /x long. 



On the fertile aments of Alnus serrulata and of A. incana, in 

 autumn and spring. 



Reported from Massachusetts (Farlow), New York (Peck), New 

 Jersey and Pennsylvania (Ellis); said to be common in these localities. 

 The genus Erysiphella was proposed for this when it was supposed 

 there were no appendages. 



E. trina, Hark. Trans. Cal. Acad, of Sci. 1884, p. 41. 



Epiphyllous. Mycelium covering orbicular spots, pruinose, fuga- 

 cious. Perithecia clustered, minute, yellowish-brown, 56-70 lz; append- 

 ages none. Asci 3, nearly globular, 31-38 /i. Sporidia 2, oblong- 

 elliptical, or somewhat boat-shaped, very large, sometimes filling the 

 ascus, 18-20x28-32 t x. 



On Quercus agrifolia, California (Harkness). Inserted from 

 paper by Dr. Harkness, read before the California Academy of Sci- 

 ences, February 4, 1884. 



No specimens examined. In the original, Erysiphella is given 

 as an alternate genus. 



