. The British rust fungi (Uredinales), their biology and classification. Uredineae. 92 UROMYCES the leaves. The mycelium of the secidial stage is said to be pei-ennial in the host ; Dietel says that in some localities the eecidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from in the fact that the sori are smaller, distributed more uniformly over the leaf, and do not cause distortions. The tecidium is rare in Britain (I have seen specimens only from Perth); most of our records of Uromyces on T. repen
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 92 UROMYCES the leaves. The mycelium of the secidial stage is said to be pei-ennial in the host ; Dietel says that in some localities the eecidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from in the fact that the sori are smaller, distributed more uniformly over the leaf, and do not cause distortions. The tecidium is rare in Britain (I have seen specimens only from Perth); most of our records of Uromyces on T. repens belong to the following common species, V. flectens. Pseudopeziza Trifolii (a Discomycete) is common on leaves of white clover and is not infrequently mistaken for the uredo-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 Bust (Uromyces) or the Clover Leaf-spot {Pseudopeziza). Distribution : Europe, Asia Minor, Persia, North and South America, Australia. 7. Uromyces flectens Lagerh. Uromyces flectens Lagerh. Sveusk Bot. Tidskrift, iii. 36. Sydow, Monogr. ii. 360. Grove, Journ. Bot. 1911, p. 866. Puccinia 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, i—2 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. Teleutospores on T. On Trifolium vepens. May—October. lepens. Common. (Fig. 44.) It has been frequently noticed that the Uromyces on Trifolium repens behaves differently in different localities; sometimes forming teleutospores only, from May to October; at others forming both secidia and uredosporea during the same time. Plowright records an interesting experiment which he performed (Ured. p. 125) ; in
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