ON LEGUMIXOS/E 



91 



(!. Uromyces Trifolii-repentis Liro. 



U. Trifolii-repentis Liro, Act. Soc. Faun. Flor. Fenn. xxix. 15. Sydow, 

 Monogr. ii. 131. Fischer, Ured. Schweiz, p. 23, f. 19. 



U. Trifolii Plowr. Ured. p. 124 p.p. Sacc. Syll. vii. 534 p.p. 

 McAlpine, Rusts of Australia, p. 97, f. 142, & pi. G, f. 32. 



Trichobasis fallens Cooke, Micr. Fung. p. 226 p.p. 



Puccinia fallens Cooke, Handb. p. 508 p.p. 



Nigredo Trifolii Arthur, N. Amer. Fl. vii. 255. 



Spermogones. Epiphyllous, honey-coloured, forming minute 

 clusters. 



JEcidiospores. iEcidia hypophyllous, in clusters, roundish 

 on the leaves and as much as 5 mm. long on the nerves and 

 petioles, shortly cylindrical, whitish-yellow; margin white, torn, 

 hardly revolute; spores minutely verruculose, yellowish, 17 — 

 21 x 14— 18 fi. 



Uredospores. Sori hypophyllous and on the petioles, 

 scattered over the leaves or gregarious, small or rarely confluent 

 and larger, soon naked, pulverulent, pale-brown ; spores globose, 

 ovate or ellipsoid, echinulate, yellow-brown, 19 — 26 x 17 — 24 /m ; 

 epispore about Hyu, thick, with two to four (generally two) 

 equatorial germ-pores. 



Teleutospores. Sori surrounded by the cleft epidermis, 

 similar, but elongated on the 

 petioles, and darker brown; 

 spores globose to ovate, rounded 

 at the apex, with a very small 

 hyaline papilla, smooth or at 

 times bearing a few minute 

 warts arranged more or less in 

 lines, brown, 18—30 x 16—25/*; 

 epispore about 2fi thick ; pedi- 

 cels short, thin, hyaline, decidu- 

 ous. 



Fit;. 43. U. Trifolii-repentis. a, 

 secidia on young leaf ; b, urerto- 

 aml teleuto-sori, on later-formed 

 leaf. 



On leaves and petioles of Trifolium repens. iEcidia (rare) 

 from April and uredospores from May onwards. (Fig. 43.) 



This species is distinguished from U. Trifolii Lev. by the smaller 

 number of germ-pores of the uredo, and also by the presence of the secidia, 

 which cause long crooked swellings on the petioles and nerves, but not on 



