MAMMOTH CLOVER RUST 257 



The rust on mammoth clover was transferred to red clover only 

 and the rust on red clover transferred to mammoth through the 

 aeciospores and urediniospores of each. 



SYNONOMY. 



(Referring to the rust on T. pratense L.). 



1. Uromyces trifolii (Hedw. f.) Lev. Monographia Uredina- 

 rium 2:133. 



2. U. trifolii (Hedw. f.) Lev. The British Rust Fungi. Grove, 

 p. 92. 



3. U. fallens (Desm.) Kern. Danish Fungi. Lind, p. 338. 



4. Nigredo fallens (Desm.) Arth. N. Am. Flora 73:255 Arthur. 

 Note — Synonomy prepared by Dr. J. J. Davis, Wisconsin Uni- 

 versity. 



Causal Organism. — The causal organism is probably Uromyces 

 trifolii (Hedw. f.) Lev. and all stages are found on mammoth 

 clover. There is not enough definite proof to establish a new species. 



CONCLUSIONS. 



L This rust on mammoth clover may be transferred to red clover. 



2. The rust on red clover may be transferred to mammoth clover. 



3. All stages of the clover rust may occur on mammoth clover. 



4. The rust can not be transferred to alsike and to white clover. 



5. There seem to be morphological differences between this rust 

 and the rust on red clover. 



(a) Sizes of the different spores. 



(b) Thickness of peridial cells. 



Iowa State Teachers College. 



LITERATURE CITED 



1. Davis, J. J., A Provisional List of the Parasitic Fungi of Wisconsin, 



Fart II, 17, 984, 1914. 



2. Arthur, North American Flora (Urediniales), 3, 219, 1912. 



3. Saccardo, Sylloge Fungorum, 21, 542, 1912. 



4. Saccardo, Sylloge Fungorum, 7, 534, 1888. 



5. Kern, F. D., Rusts of White and Red Clover: Phytopath., 1, 3-6, 1911 



6. Sydow, Monographia Uredinearum, 2, 131-133, 1910. 



7. Ivanoff, Untersuchunger uber den Einfluss des Standortes auf den 



Entwickelingsgang und den Peridenbau den Uredineen. Centralblat 

 fur Bakter und Parasitet, 18, 265-470-655-661, Fig. 33, 1909. 



8. Liro, Acta Societatis pro Fauna et Flora Fennica, 29, 11, 1906. 



9. Howell, J. K., Bull. Cornell Univ. Ag. Exp. Sta., 24, 129-139, 1890. 



10. Pammel, L. H., Bull. la. Ag. Exp. Sta., 13, 51-55, May, 1891 



11. Grove, The British Rust Fungi, p. 92. 



17 



