236 Trans. Acad. Sci. of St. Louis. 



by a long, infrequently branched septate promycelium. 

 Knee ioints abundant, and producing slender germ-tubes 

 which often fuse with another part of the promycelium. 

 Conidia few, never in nutrient solutions, short and fre- 

 quently stalked as shown in fig. 11, Plate XXVII. 



On Andropogon scoporius. One specimen from Manhattan 

 found in a student's herbarium. In the inflorescence, covered 

 by a whitish membrane. 



Germination (Plate XXIX. 6-8) by a short promycelium 

 two or three times septate, constricted at the septa and bear- 

 ing few short thick conidia. 



17. U. UTRicuLOSA (Nees) Tul., Ust., p. 102. 



On Polygonum acre, Rooks and Barton counties, and P. 

 Pennsylvanicum, Riley. Filling the flowers with a purplish 

 mass of spores. Smutted plants are easily distinguished by 

 the compact appearance of the spikes. 



Repeated attempts at germination unsuccessful. Saccardo 

 gives a short description of the germination in the Sylloge 

 Fungorum. Plowright speaks of the difficulty of ger- 

 mination. 



18. U. Andropogonis, Kell. & Swing., Jour. Myc, 1889, 

 p. 12. ( !) (Plate XXVI. 14-17.) 



Common on Andropogon provincialis from several places 

 in the State, and on A. Hallii, Arkalon and Harper. The 

 smut causes the host plant to flower several weeks earlier 

 than normally, and the afl'ected plants are about half as high 

 as healthy ones. 



No germination in water. In nutrient solutions the spores 

 germinate after two or three days, but produce only an un- 

 divided and unbranched tube of moderate lensrth, and no 

 conidia. 



19. U. BouTELOUAE Kell. & Swing., Jour. Myc, 1889, p. 

 12. (!) (Plate XXIX. 11.) 



In ovaries of Bouteloua oligostachya. Rooks and Riley 

 counties. 



