. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 92 UROMYCES the leaves. The mycehum of the seoidial stage is said to be perennial in the host; Dietel says that in some localities the secidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from U. Jkctens in the fact that the sori are smaller, distributed more uniformly over the leaf, and do not cause distortions. The Eeoidium is rare in Britain (I have seen specimens only from Perth); most of our records of Uroinyces on T. repens
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 92 UROMYCES the leaves. The mycehum of the seoidial stage is said to be perennial in the host; Dietel says that in some localities the secidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from U. Jkctens in the fact that the sori are smaller, distributed more uniformly over the leaf, and do not cause distortions. The Eeoidium is rare in Britain (I have seen specimens only from Perth); most of our records of Uroinyces on T. repens belong to the following common species, U. fleetens. Pseudopeziza Trifolii (a Discomycete) is common on leaves of white clover and is not infrequently mistaken for the xiredo-stage of U. Trifolii-repentis, but is distinguishable by its being confined to the upper surface of the leaves. No practical means of prevention are known for either the Clover Rust (Uromyces) or the Glover Leaf-spot {Pseudopeziza). DiSTBlBUTlON: Europe, Asia Minor, Persia, North and South America, Australia. 7. Uromyces flectens Lagerh. Uromyces flectens Lagerh. Svensk Bot. Tidskrift, iii. .36. Sydow, Monogr. ii. 360. Grove, Jouru. Bot. 1911, p. 366. Puccima neurophila De Toni, Sacc. Syll. vii. 698. Teleutospores. Sori hypophyllous, or more often on the nerves and petioles where they cause swell- ings and distortion, scattered, rather large, ^â2 mm. long or even confluent and larger, long covered by the epidermis, then pul- verulent,, dark-brown; spores as in U. Trifolii-repentis. Fig. 44. U. flectens. Teleutospores on T. Qn Trifolium repens. MayâOctober. â )epens. Common. (Fig. 44.) It has been frequently noticed that the Uromyces on Trifolhim repens behaves differently in dift'ereut localities; sometimes forming teleutospores only, from Slay to October; at others forming both secidia and uredospores during the same time. Plowright records an interesting experiment which he performed (Ured. p. 125); i
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