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 Bep. 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. Bivonce, Lev. on Ulmus campestris 

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

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

 (10-15 ;») 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 i^ long but narrower than in U. macrocarpa. 



U. flexuosa, Peck. 



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



Hypophyllous. Perithecia large 110-125 //., 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 /* long. 



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

 with its more numerous spores separate it from U. adunca L6v. to which 

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



On jEsctdus 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 ^ in greatest diameter, texture soft, 

 reticulations very small and irregular; appendages verynumer- 



