2OO AMERICAN JOURNAL OF BOTANY [Vol. 9. 



of leaf I cm. in length giving the numbers 174 to 158, and 217 to 195 re- 

 spectively. The sori on the upper surface are more pulverulent. 



The uredos on the wheat, rye, and Agropyron were certainly not dis- 

 tinguishable by morphological characters. The pustules on the barley 

 show very little pulverulence. Measurements of the pustules on the barley 

 (measurements being made on the size of the rupture in the epidermis) 

 show them to be of the same size as the pustules on the other hosts of P. 

 disperse, . The spores of the barley rust are narrower than those on the 

 other cereals. Twenty-five spores gave an average ratio of length to width 

 of 1. 218. Seven such measurements on wheat gave ratios ranging from 

 1.083 to 1.163. 



Puccinia graminis Pers. : 



On Phleum pratense, at Tom's River, N. J., August 23. Only II was found on this 

 host, as others have noted. 



On oats, at Tom's River, N. J., August 23 (II, III); at Williamsbridge, N. Y., August 

 16 (II, III); at the New York Botanical Garden, August 26 (II, III). The rust 

 was never abundant, occurring as a thin sprinkling on the leaves and sheaths 

 among the crown-rust sori, and on the culms. The long, rectangular, erumpent 

 teleutosori are very conspicuous scattered among the mass of smaller, covered sori 

 of the crown rust. 

 Puccinia coronifera Kleb. : 



On oats, at Williamsbridge, N. Y., August 2 to September (II, III); at the New York 

 Botanical Garden, August 12 to October (II, III); at Tom's River, N. J., August 23 

 (II, HI)- 



The crown rust of the present collections differs in some minor particulars 

 from the published descriptions I found it somewhat later in its appear- 

 ance on the sheath, but both uredo and teleuto in the end are as abundant 

 on the sheath as on the leaf blade. Eriksson and Henning (p. 240) found it 

 " rarely on the sheath." Both the uredo and the teleuto occur in abundance 

 on the lower and the upper surfaces of the leaves, but the uredo is always 

 in excess on the upper surface while the teleuto first appears and is always 

 in advance in its development on the under surface. Grove (p. 256) and 

 Fischer (p. 375) describe the teleuto as hypophyllous. The most con- 

 siderable discrepancy between the descriptions of Grove and Plowright and 

 the rust here described is in the number of the germ pores. Five spores of 

 which the germ pores were counted showed respectively 9, 9, 9, n, and 8 

 pores. The germ pores as well as the spines are inconspicuous until brought 

 out by treatment with lactic acid. Grove (p. 256) and Plowright (p. 164) 

 describe the germ pores as 3 to 4 in number. Fischer (p. 275) simply icfers 

 to them as inconspicuous, and Eriksson and Henning (p. 240) do not men- 

 tion them in their description of the crown rust. 



Puccinia impatientis (Schw.) Arth.: 



On Elymus virginicus L., at Valley Stream, L. I., August 12 (II); at Hackensack, N. J., 

 September 18 (III); at the New York Botanical Garden, June to October (II, III). 



At the last-named station Impatiens aurea Muhl. near by was infected 



