64 ILLINOIS BIOLOGICAL MONOGRAPHS [532 



inclined to include all of these forms, growing as they do upon members 

 of one family, in one single species, recognizing as varieties such as 

 show well-marked and constant difference. These differences are usually 

 in the setae, which on some hosts are almost invariably simple, on others 

 slightly toothed, and on still others much toothed and contorted. 



The species as manifest on some of its hosts clearly agrees with 

 M. bicornis Wint of Rabenhorst's Fungi Europaei, No. 3545, collected 

 on an unknown legume in Brazil, May 1885 ; with an authentic specimen 

 kindly loaned from the Kew Gardens ; with a specimen of the Heller col- 

 lection determined by Earle and with a cotype specimen kindly sent to me 

 by Dr. H. Sydow. It does not, however, conform to the description of 

 this species as given by Gaillard, or the original description of Winter, 

 in that the capitate hyphopodia are not often opposite, as they describe, 

 and as Gaillard figures them, nor are the setae deeply bifid as he describes 

 and figures. Since the original description was by Winter and the 

 Brazilian specimen was published by Winter, and our specimen is clearly 

 co-specific with the Brazilian specimen, it seems best to regard the pres- 

 ent series as M. bicornis. 



On Meibomia, the tips are either acute and simple, or bifid or 

 toothed. Some collections are uniformly simple, others uniformly 

 toothed, yet the species appears to be identical. The collections on 

 M. adscendens and M. axillaris are rarely forked, while those on M. supina 

 are rarely undivided. One collection on M. axillaris, No. 7838, how- 

 ever showed a remarkable variant, with much and very irregularly 

 forked apices. The form on Erythrina has few setae and these sometimes 

 contorted at the tip. The specimens on Bradbury a show the capitate 

 hyphopodia somewhat more angular, with simple and unusally bent 

 setae. 



95a. M. BICORNIS var. calopogonu var. nov. 



On Calopogonium orthocarpum Urb. 



Dos Bocas, below Utuado, July 8, '15, 8060, Dec. 16, '13, 6035. 



Mayaguez, Oct. 31, '13, 3492, Apr. 10, '13, 372. Aguada, Nov. 22, 

 '13, 5087. 



The form on Calopogonium shows perhaps greater differentiation 

 than any of the other forms. The setae are more rigid, more uniformly 

 fine toothed and the capitate hyphopodia are a trifle larger than on other 

 hosts. 



