. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 296 I'm: \i;mii»icm Uredospores. Sori yellow, roundish, often confluent, pul- verulent; spores ellipsoid to ovate distantly verruculose, yellow, 28—32 x21— 24 ^ Teleutospores. Sori hypophyllous, large, roundish, thick, pulvinate, black, on conspicuous purple-bordered spots; spores. Fig. 224. Ph. violaceum. a, aecidiospore; b, uredospore; c, outlines of various mature teleutospores from the same sorus; d, young teleutospore before the middle coat is fully developed, showing the fusion-nucleus in
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 296 I'm: \i;mii»icm Uredospores. Sori yellow, roundish, often confluent, pul- verulent; spores ellipsoid to ovate distantly verruculose, yellow, 28—32 x21— 24 ^ Teleutospores. Sori hypophyllous, large, roundish, thick, pulvinate, black, on conspicuous purple-bordered spots; spores. Fig. 224. Ph. violaceum. a, aecidiospore; b, uredospore; c, outlines of various mature teleutospores from the same sorus; d, young teleutospore before the middle coat is fully developed, showing the fusion-nucleus in each cell, and the gelatinous outer coat; e, mature teleutospore, the pearl-like drops are caused by the shrinking of the outer coat; c x 200, the rest x 600. cylindrical, of 1—5 (mostly four) cells, rounded at both ends, with a short yellowish papilla at the apex, hardly constricted, verrucose, brown, 65—100 x 30—35 /x ; two germ-pores to each cell; pedicels long, colourless, swollen at the base. On Rub us fruticosus. Very common, especially near the coast. August—November. (Fig. 224.) This species is easily distinguished by its large conspicuous red and purple spots, and on microscopical examination by the predominance of four-celled teleutospores. These pass the winter on the leaves, which often remain green on the plant; they germinate with the greatest readiness in April. It is an interesting fact that on some portions of the coast, such as in North Wales, this species predominates, but on other portions, in parts of Yorkshire, as I was informed by the late Mr. R. H. Philip, its place is largely taken by P. Rubi. Distribution : Europe, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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