420 Illinois State Laboratory of Natural History. 

 2. Appendages mostly hyaline. 



M. Ravenelii, Berk. 



(Grev. IV., p. 160.) 



Amphigenous. Mycelium usually abundant, persistent; 

 perithicea abundant, usually large, 100-130 ^, reticulations 

 small and irregular, about 10 i^; appendages 10-20, somewhat 

 roughened, usually hyaline, occasionally colored for a distance, 

 the color ending at an abrupt line like a septum, once or twice 

 as long as the diameter of the perithecium, 5-7 times dichoto- 

 raous, branches short, forming a more or less compact head, tips 

 not swollen at length, usually acute and recurved; asci 6-10, 

 frequently 8, ovate pedicellate, about 45 by 60 i^', spores 4-6 

 (Saccardo says 8). 



Mycelium effused, dirty white ; appendages repeatedly forked to- 

 ward the apex, much more so than in the last {M. peniciUata L6v). — 

 Berkeley, Grev. IV., p. 160. . 



On Gleditschia tricanthos: Piatt, Aug. 16, 1100; Fulton, 

 Oct. 1, 1780; McLean, Aug. 6, 2363, Oct. 6, 1861; La Salle, 

 Sept. 29, 6237; Jersey, Oct. 13, 6286. Lathyrus palustris: 

 Champaign, Oct. (Waite). Vicia Americana: McHenry, Aug. 

 20, 1211. 



In the typical form of this species, that on Gleditschia, the 

 peculiarly colored appendages mentioned in the description sel- 

 dom occur, but they may occasionally be noticed. On Vicia a 

 majority of the appendages are colored in this manner, and the 

 mycelium is rather less abundant. In other respects it agrees 

 so closely with M. Bavenelii that it does not seem best to sep- 

 arate it, especially as the appendages are not all colored on Vi- 

 cia while they are occasionally colored on Gleditschia. The 

 form on Lathyrus stands about half way between the other 

 two in the coloring of the appendages and density of the my- 

 celium. A form on Lathyrus has been referred by Trelease 

 (Parasitic Fungi of Wisconsin, p. 8.) to M. diffusa, C. & P. It 

 seems from his note to be the same as our form on this host. 

 Our specimens of M. diffusa on Desmodium, Lespedeza, and Pha- 

 seolus closely agree in the long and loose branching of their ap- 

 pendages, a character well expressed by the specific name, and 



