96 Twenty- FIFTH Report on the State Museum. 



Erysiphe Martii Lh. 



Leaves and stems of pea vines, New Baltimore. Zalrislde. 

 Sandlake, October. 



ITncinula macrospoea Pic. (Trans. Alb. Inst., vol. vii, p. 215.) 



Mycelium effused, persistent; conceptacles subglobose ; appen- 

 dages numerous, thirty or more, about equal in length to the 

 diameter of the conceptacle; sporangia eight to twelve; spores 

 two, very large, elliptical, .0012 -.0015 inch long. 

 Leaves of elm trees. Buffalo. Clinton. 



This was at first thought to be U. Bivonce Lev., but that species 

 is described as having an evanescent mycelium, only four sporangia 

 and ten to twenty appendages. 



Uncinula circinata C. <& P, 



Mycelium dense, effuse, persistent; conceptacles large, depressed 

 or flattened, black ; appendages very numerous, slender, about 

 equal in length to the diameter of the conceptacle, simple, color- 

 less; sporangia oblong or narrowly ovate, eiglit to sixteen, con- 

 taining eight spores. 



Under surface of maple leaves, Acer sjpicatum and A. riibrum. 

 Watkins and Greenbush. September and October. 



This species is related to U. hicornis from which it is distin- 

 guished by its hypogenous habit, more numerous sporangia and 

 always simple appendages. It usually occuj^ies the whole under 

 surface of the leaf. 



LTncinula Ampelopsidis Ph. (Trans. Alb. Inst., vol. vii, p. 216.) 



Amphigenous; mycelium web-like, thin, evanescent; concepta- 

 cles minute, globose, black; appendages ten to twenty, in length 

 once or twice the diameter of the conceptacle, simple, obscurely 

 septate toward the base, colored, a little paler at the tips ; sporan- 

 gia four to six, subglobose or ovate, containing four to six spores. 



Leaves of the woodbine, Ampelopsis quinquefoUa. Buffalo. 

 Clinton. Greenbush. August to October. 

 The colored appendages are characteristic of this species. 



Uncinula Clintonii PTc. (Trans. Alb. Inst., vol. vii, p. 21G.) 



Amphigenous ; mycelium thin, persistent ; conceptacles small, 

 globose, black ; appendages fifteen to twenty-five, about equal in 

 length to the diameter of the conceptacle, colorless, slightly thick- 

 ened toward the uncinate-coiled tips ; sporangia four to six, contain- 

 ing four to six spores. 



I 



