New York Uneinulce. 



215 



Both surfaces of leaves of willows and poplars. Common. 

 September and October. 



3. Uncinula macrospora, n. sp. 



Mycelium effused, persistent; conceptacles .005 inch 

 in diameter, subglobose ; appendages numerous, about 

 equal in length to the diameter of the conceptacle, 

 sporangia 8-12; spores 2, large, elliptical, '0012 -.0015 

 inch long. Figs. 4-6. 



Both surfaces of elm leaves. Buffalo. October. G. W. 

 Clinton. 



This species is remarkable for the large size of its spores. 

 U. Bivonce Lev. and U. polychceia, B. & C. have two spores 

 in a sporangium, but the former may be separated from 

 the present species by its fewer sporangia and less numer- 

 ous appendages, and the latter, by its larger conceptacles 

 and much more numerous oblong sporangia. 



4. Uncinula Torreyi Gerard, n. sp. 



Mycelium very thin, evanescent ; conceptacles scattered 

 minute, .003 -.0035 inch in diameter; appendages 

 numerous, slender, scarcely as long as the diameter of the 

 conceptacle ; sporangia ovate, 6 - 8 ; spores 6. 



Lower surface of leaves of Celtis occidentalis. Pough- 

 keepsie. September. W. JR. Gerard. 



5. Uncinula flexuosa, n. sp. 



Mycelium thin, web-like, evanescent ; conceptacles min- 

 ute, .0035 inch in diameter; appendages 15 - 25, about as 

 long as the diameter of the conceptacle, the apical half 

 wavy-flexuous and sometimes slightly thickened ; sporangia 

 8-10, ovate or elliptical; spores 8, elliptical; .0007- 

 .0008 inch long. Figs. 10 - 12. 



Lower surface of horse-chestnut leaves. Buffalo. Sep- 

 tember. G. W. Clinton. 



The flexuous appendages are characteristic of this species. 

 They sometimes appear as if twisted like the blade of a 

 screw-auger. 



