184 NATURAL, HISTORY BULLETIN. 



andropogonis . The Greek noun -,:,y,ov being in the third 

 declension, a Latin derivative like Andropogon should be 

 also in the third declension, and not in the second as 

 assumed by Schweinitz and others. 



The rust is very common, especially upon Andropogon 

 scoparins Michx. We have examined specimens on this 

 host collected in New York, Pennsylvania, Alabama, 

 Louisiana, Indiana, Iowa, North Dakota, Nebraska, 

 Kansas and Nevada. We have examined specimens on A. 

 furcatus Muhl. (A. provincial is Lam.) from Mississippi, 

 Indiana, Iowa and Nevada: on A. virginicns L. from 

 Alabama: on A. argyraccns Schultes from Alabama: on 

 A. Iiallii Hack, from Nebraska: on Pentstemon hirsutus 

 (L.) Willd. {P. pubcsccns Sol.) from Alabama, Indiana 

 and Kansas: on P. albidus Nutt. from Kansas: on P. 

 grandiflorus Nutt. from Nebraska, and Iowa, and on P. 

 gracilis Nutt. from Iowa. 



40. Puccinia versicolor Diet. & Holw ■. (1897. Bot. 

 Gaz. 24:28). 



40a. On Andropogon melanocarpus Ell. III. Guadalajara, Mex., 

 Holway. 



40£. On Andropogon melanocarpus Ell. ii, III. Cuernavaca, Mex., 

 Holway. 



40c. On Andropogon melanocarpus Ell. II, iii. Cuernavaca, Mex., 

 Holway. 



40d. On Andropogon contortus E. II, III. Chapala, Mex., Holway. 



Orig. Desc. "Spots epiphyllous, purple-red, or brown and yellow; 

 sori hypophyllous, oblong or linear; uredosori yellow, surrounded 

 by the ruptured epidermis; spores ovate, 30-40 by 25-31//, epispore 

 very thick, colorless, with short spines, contents irregularly 

 branched, or often star shaped; teleutosori firm, pulvinate, black, 

 surrounded by the ruptured epidermis; spores elliptical, scarcely 

 constricted, rounded at both ends, smooth, chestnut brown, apex 

 variously thickened, (generally not over 8/0 35-45 by 27-33//; pedicel 

 hyaline, firm, up to 130// long." 



This species has a uredospore of remarkable appearance. 

 The walls are colorless and appear to be thickened like the 

 sclerenchymatous cells of seed coats, thus forcing the 



