PROTOBASIDIOMYCETES 399 



VII. BEET RUST 

 Uromyces Beta (Pers.) Tul. 



KUHN, J. Der Rost der Runkelriibenblatter, Uromyces Beta. Bot. Zeitg. 27 : 



540-544. 1869. 

 MCALPINE, D. The Rusts of Australia, /. c., Uromyces beta (Pers). Kiihn., 



1 00-101. pi. 17, figs. 148-149; pi. 43, fig. 316; pi. H. 



The spermogonia occur in small, yellowish groups, and the aecidia 

 in similarly colored but somewhat larger spots, within which they 

 may be arranged in circular or regular form. The aecidia are 

 saucer-shaped and white, the aecidiospores more or less isodiametric, 

 1 7-36 fjL in diameter, with orange-colored contents. Both the uredo 

 and the teleuto stages occur in sori irregularly distributed over the 

 surfaces of the leaf, often circularly disposed. The uredospores are 

 mostly obovate, 21-24 * 35A t - The walls are provided with some- 

 what distant echinulations and two opposite germ pores. The 

 teleutospores are similarly obovate, 18-24 X 2 5~3 2 A t - The wall is 

 scarcely thicker at the apex, with an apical germ pore, and a very 

 distinct papilla of the same diameter as the germ pore. The 

 pedicel is short and persistent. This fungus is prevalent in 

 Australia, and it is not uncommon in Europe ; but in the United 

 States it appears only to have been observed in California. This 

 species is found on cultivated beets (Beta vulgaris\ also on wild 

 species of this genus. According to the observations of Kiihn the 

 mycelium may be biennial in the host, forming aecidia practically 

 throughout the year. 



VIII. CARNATION RUST 



Uromyces Caryophyllinus (Schrank) Wint. 



ATKINSON, GEORGE F. Carnation Diseases. Amer. Florist 8 : 720-728. figs. 



STEWART, F. C. Combating Carnation Rust. N. Y. (Geneva) Agl. Exp. Sta. 



Rept. 15: 461-495. 1895. (Also Built. 100.) 

 STUART, WM. Some Studies upon Carnation Rust. Vermont Agl. Exp. Sta. 



Rept. 8 : 115-118. 1894. 



Occurrence and effects. The fungus causing carnation rust was 

 recognized in Europe more than a century ago, and it was properly 

 named during the first half of the nineteenth century. It has long 

 been recognized as a common disease of the carnation (Dianthiis 



