. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 92 IKOMVCKS the leaves. The mycelium of the secidial stage is said to be perennial in tin' host; Dietel says that in some Localities tin- secidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from U. flectens in the fad that tlu' sori are smaller, distributed more uniformly over the leaf, and do not ( ause distortions. The a M-id i i mi is ran- in I'.ritain (I have seen specimens only from Perth : most of our recor
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 92 IKOMVCKS the leaves. The mycelium of the secidial stage is said to be perennial in tin' host; Dietel says that in some Localities tin- secidiospores can re- produce themselves, and that then the uredo is suppressed. Both this species and the preceding are distinguished from U. flectens in the fad that tlu' sori are smaller, distributed more uniformly over the leaf, and do not ( ause distortions. The a M-id i i mi is ran- in I'.ritain (I have seen specimens only from Perth : most of our records of I'romyces on T. repens belong to the following common epecies, U. 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, bui 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 {Uromyees) or the Clover Leaf-spot {Pseudopeziza). DISTRIBUTION: Europe, Asia Minor, Persia, North and South America, Australia. 7. Uromyees flectens Lagerh. Uromyees flectens Lagerh. Svensk Bot. Tidskrift, iii. ."50. Sydow, Monogr. ii. 360. Grove, Journ. Bot. 1911, p. 366. Puccinia neurophila De Toni, Sacc. Syll. vii. 698. Teieutospores. Sori hypophyllous, or more often on the nerves and petioles where they cause swell- ings and distortion, scattered, rather large, ^—2 mm. long or even continent and larger, long covered b}* the epidermis, then pul- verulent, dark-brown; spores as in U. Trifolii-repentis. Fig. 44. U. flectens. Teieutospores ou t. On Trifolium repens. May—October. Common. (Fig. 44.). repens, It has been frequently noticed that the Uromyees on Trifolium repens behaves differently in different localities ; sometimes forming teieutospores only, from .May to October; at others forming both secidia and uredospores during the same time. Plowright records an interesting experiment w
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