408 Illinois State Laboratory of Natural History. 



Mycelium effused, persistent; conceptacles subglobose; appendages 

 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- Peck, 25th Rep. N. Y. State Mus., p. 96. 



On Ulmus Americana: Fulton, Oct. 1, 1776, 1781; McLean, 

 Oct. 12, 1852. Ulmus alata: Union, Oct. 2, 6547. Oct. 21, 1916, 

 1934, Oct. 22, 1962, 2377, Oct. 25, 2023, Oct. 28, 2073, 2091. 



This abundantly occurring species differs sufficiently from 

 European specimens of U. Bivona>, Lev. on Ulmus campestris 

 (Thiim. Mycoth. Univer. No. 755). In these the perithecia 

 are smaller (80-90 jtt), and the reticulations are much larger 

 (10-15 i*.) and more distinct. The fewer (less than 20) ap- 

 pendages are stouter, somewhat roughened and conspicuously 

 swollen at the tip. The usually four asci each contain two 

 spores about 30 t*. long but narrower than in U. macrocarpa. 



U. flexuosa, Peck. 



(Trans. Albany Inst, VII., p. 215.) 



Hypophyllous. Perithecia large 110-125 jw, dark, opaque, 

 reticulations obscure; appendages numerous, 40 or more, about 

 equaling the diameter of the perithecium, hyaline, minutely 

 roughened, thickened and irregularly flexuous toward the tip; 

 asci about 10, ovate or pyriform, strongly pedicellate; spores 8, 

 small, 15-20 ft long. 



The wavy-flexuous appendages are peculiar to this species, and 

 with its more numerous spores separate it from U. adunca Lev. to which 

 it is sometimes referred. — Peck, 26th Rep. N. Y. State Mus. p. 80. 



On ^I^Jsculus sps.: Union, Sept. 15 (Earle). 



This handsome and peculiar species is well characterized 

 by the several abrupt changes of direction in the upper half of 

 the appendage, which give it a peculiar wavy outline. 



U. circinata, C. & P. 



(Erysiphei of the U. S. in Jour, of Bot. 1872.) 



Hypophyllous. Mycelium inconspicuous; perithecia very 

 large, depressed, 150-175 fi in greatest diameter, texture soft, 

 reticulations very small and irregular; appendages very numer- 



