. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. his IMCCINIA the fusiform shape, thin walls, and pale colour of the teleutospores, which often become totally devoid of thickening al tin- apex, by the dropping off of the pale thickening cap, ou germination. /'. punctata is additionally distinguished by the presence of the aecidium. Fischer explains the fact, that distortions more usually accompany /'. Valantiae, by the consideration that infection takes place from the basidiospores mainly through the cuticle of young ami still growing parts,
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. his IMCCINIA the fusiform shape, thin walls, and pale colour of the teleutospores, which often become totally devoid of thickening al tin- apex, by the dropping off of the pale thickening cap, ou germination. /'. punctata is additionally distinguished by the presence of the aecidium. Fischer explains the fact, that distortions more usually accompany /'. Valantiae, by the consideration that infection takes place from the basidiospores mainly through the cuticle of young ami still growing parts, while teleuto-sori of P. punctata ami /'. C't'/akoeslya/,a are produced by infection from spores whose germ-tubes can penetrate the stomata of parts of the plant which are already fully developed. The relations between the three species are very like those which subsist between Uromyces Trifolii-repentis, U. Trifolii, and U. flectens. Distribution : Europe, North America. 40. Puccinia difformis K. et S. Puccinia diffomiis K. et S. Myk. Heft. i. 71 (1817). Cooke, Handb. p. 501 : Micr. Fung. p. 208. P. Galii Plowr. Ured. p. 144 P. ambigua Lagh. in Sydow, Uredineen, no. 1056 (1897). Sacc. Syll. xvi. 288. Sydow, Monogr. i. 216. jEcidiospores. /Ecidia hypophyllous, on yellow spots, soli- tary or irregularly disposed over the whole leaf, whitish-yellow, with torn rerlexed margin; spores verruculose, orange, 13—25 fx. Teleutospores. Sori hypophyllous or on the stems, small, elliptic, soli- tary or clustered, on the stems often elongated and confluent, long covered by the ash-coloured epidermis, then naked, firm, black ; spores ellipsoid to clavate, much thickened above, hardly constricted, tapering below, smooth, brown above, paler downwards, 35— 55 x 15—25 fx; pedicels brownish, persistent, as long as the spore or longer. On Galium Aparine. July—August. Surrey, Kent. (Fig. 118.). Fig. 118. P. difformis. Please note that these images are extracted from sca
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