. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON LEGUMINOSiE 91 6. Uromyces Trifolii-repentis Liro. U. Trifolii-repentis Liro, Act. Soc. Faun. Flor. Fenn. xxix. 15. Sydow, Moiiogr. ii. 131. Fischer, Ured. Schweiz, p. 23, f. 19. U. Trifolii Plowr. Ured. p. 124 Sacc. Syll. vii. 534 ). McAlpine, Rusts of Australia, p. 97, f. 142, & pi. G, f. 32. Triahohasis fallens Cooke, ilicr. Fung. p. 226 PiLccinia fallens Cooke, Handb. p. 508 Nigredo Trifolii Arthur, N. Amer. Fl. vii. 255. Spermogones. Epiphyllous, honey-coloured, forming minute clus
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON LEGUMINOSiE 91 6. Uromyces Trifolii-repentis Liro. U. Trifolii-repentis Liro, Act. Soc. Faun. Flor. Fenn. xxix. 15. Sydow, Moiiogr. ii. 131. Fischer, Ured. Schweiz, p. 23, f. 19. U. Trifolii Plowr. Ured. p. 124 Sacc. Syll. vii. 534 ). McAlpine, Rusts of Australia, p. 97, f. 142, & pi. G, f. 32. Triahohasis fallens Cooke, ilicr. Fung. p. 226 PiLccinia fallens Cooke, Handb. p. 508 Nigredo Trifolii Arthur, N. Amer. Fl. vii. 255. Spermogones. Epiphyllous, honey-coloured, forming minute clusters. JEcidiospores. ^cidia hypophyllous, in clusters, roundish on the leaves and as much as 5 mm. long on the nerves and petioles, shortly cylindrical, whitish-yello-vv; margin white, torn, hardly revolute; spores minutely verruculose, yellowish,, 17— 21 X 14—18 iM. 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 fj,; epispore about l^/u, 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 ^;imes bearing a few minute warts arranged more or less in lines, brown, 18—30 x 16—25/j,; epispore about 2yu, thick; pedi- cels short, thin, hyaline, decidu- ous. On. leaves and petioles of Trifolium repens. ^cidia (rare) from April and uredospores from May onwards. (Fig. 43.) This species is distinguished from U. Trifolii L6v. 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. Fig. 43. CI. Trifolii-repentis. a, fficidia on young leaf; b, uredo- and teleuto-so
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