Autduiironiyccs. I2; 



Uredospores — Sori pale brown, rounded, scattered, surrounded by 

 the torn epidermis. Spores round or ovate, with three or four 

 germ-pores, echinulate, brown, 20-26 x 18-20/x. 



Tdeutospores — Sori small, rounded, almost black, long covered by 

 the epidermis. Spores globose, elliptical or subpyriform, with 

 wart-like incrassations on their summits, smooth, dark brown, 

 22-30 X 15-20/X. Pedicels long, deciduous. 



Synonyms. 



Uromyces trifolii (Alb. and Schw.). Winter in Rabh., " Krypt. 

 Flor.," vol. i. p. 159. 



Uredo fabce, p. trifolii. Alb. and Schw., " Consp.," p. 127. 



Fuccinia fallens. Cooke, " Hdbk ," p. 508; "Micro. Fungi," 

 4th edit., p. 212, in part. 



Tric/iobasis fallens. Cooke, "Micro. Fungi," 4th edit., p. 226. 



Uromyces apiailatus, Lev. Cooke, "Grevillea," vol. vii. 

 p. 136. 



Exsiccati. 

 Cooke, i. 116 ; " L. F.," p. 40. Vize, "Fungi Brit.," 18. 



On Trifolium prate use, and repens. 



^cidiospores, May; uredospores. May; and teleutospores, 

 May to November. 



Biology. — The Uredo and Uromyces frequently attack the 

 petioles, where they cause elongated swellings and distortions. 

 Schroter has found the a^cidiospores only on TrifoUuni repens, and 

 states that this stage is of very short duration. A plant of T. 

 repefts, with the Uromyces upon it, was in October brought indoors 

 and kept there until the following summer. During all this time it 

 produced only teleutospores, no aicidiospores. In the open air the 

 foliage would probably have been destroyed by the cold, so that the 

 fungus would, therefore, have been unable to have kept itself alive, and 

 would of necessity have been compelled to develop ascidiospores in 

 spring from the last year's teleutospores (Schroter, " Cohn's Beitrage," 

 vol. ii. p. 78). Dr. Cooke has observed bicellular teleutospores 

 {Seem. four.,vo\. iv., 1866) on Vicia sepium ; they were few in number, 

 and mixed with the uredospores. 



