Igo BOTANICAL GAZETTE [SEPTEMBER 
for barley, and one for rye, oats, Hordeum jubatum, Agropyron 
tenerum, A. repens, and Avena fatua. 
5. Uredospores of P. graminis failed to survive the winter of 
1904-1905 at Fargo, North Dakota. 
6. The wintering of P. graminis as mycelium in plant tissues 
in North Dakota is very doubtful, as shown by the late appear- 
ance of the uredo pustules in the spring and the failure of rusted 
grasses to produce the uredo again after being housed during the 
winter. 
7. The pericarp of rusted wheat grains is frequently filled with 
rust mycelium and numerous pustules of teleutospores. 
8. Teleutospores in some of the germinating grains appeared 
to be germinating in a palmella-like stage. 
g. Pieces of mycelium resembling rust were found in the cells 
of the scutellum close to the growing plant. 
In conclusion, I wish to acknowledge my indebtedness to Dr. 
R. A. Harper for aid in the cytological study of the material and 
in the preparation of the paper. 
UNIVERSITY OF WISCONSIN 
ADISON, WIS. 
LITERATURE CITED 
1. Barctay, A., Rust and mildew in India. Jour. Bot. 30:—. 1892. 
2. Bary, ANton De, Recherches sur le développement de auelaiie champig- 
nons parasites. Ann. Sci. Nat. Bot. IV. 20:—. 1863. 
. —, Neue Untersuchungen iiber die Crednien: insbesondere die 
Entwicklung der Puccinia graminis und den Zusammenhang derselben 
mit Aecidium Berberidis. Mon. Ber. Akad. Wiss. Berlin. 1865. 
, Neue Untersuchungen iiber Uredineen. Mon. Ber. Akad. Wiss. 
Be "1866. 
5. BLAcKMAN, V. H., On the conditions of teleutospore germination and of 
sporidia formation in the Uredineae. New Phytologist 2:10. 1903. 
6. Bottey H. L., ey rust; is the infection local or general in origin? 
Agri. Sci. 5: 263. 
7. ———, Rust nae etc. N.D. Agr. Exp. Sta. Bull. 68. 1906. 
8. Beevetp, Oscar, Untersuchungen aus dem Gesamtgebiete der Myko- 
logie 14:154. I 
g. CARLETON, M. A., Coreal rusts of - United States. U.S. Dept. Agric., 
Div. Veg. Phys. and Path., Bull. 1899. 
