. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 104 i ROMYCES. Te/t'itttispures. Sori similar, but less pulverulent, and blackish-brown : spores subglobose to ovate, not thickened above, but with a hyaline papilla as much as (i /x high, smooth, brown, 22â35x18â25/a; pedicels short, hyaline, deciduous. On Geranium dissectum, G. 'mode, G. Teleutospores on G. pratense, G. pyrenaicum, G. silvaticum. silvaticum. XT . â-, . ,. â ... , T JNot common, /hcidia, Marcn to June: beleutospores, JuneâOctober. (Fig. 57.) Lire proved that the secidium of th
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 104 i ROMYCES. Te/t'itttispures. Sori similar, but less pulverulent, and blackish-brown : spores subglobose to ovate, not thickened above, but with a hyaline papilla as much as (i /x high, smooth, brown, 22â35x18â25/a; pedicels short, hyaline, deciduous. On Geranium dissectum, G. 'mode, G. Teleutospores on G. pratense, G. pyrenaicum, G. silvaticum. silvaticum. XT . â-, . ,. â ... , T JNot common, /hcidia, Marcn to June: beleutospores, JuneâOctober. (Fig. 57.) Lire proved that the secidium of this parasite from G. silvaticum produced uredo- and teleutospores on the sunn' plant, and Bock showed that the uredospores from the same specie- reproduced themselves on ether hosts of the same genus. But there is another secidium occurring on G. pratense and G. silvaticum, which belongs to a quite different life- cycle. This is JEcidium sHvtjuiitolentiim Lindr., and is the secidial stage of the hetercecious Puccinia Polygon! umphibii Pers. (). It differs from the secidium of C. Geranii in being seated on conspicuous blood-red or deep-purplish spots which are not distinctly thickened ; moreover the shape of the spores is that usual in secidiospores, viz. rounded-polygon, d, while those of C. Geranii are always more or less ovate, and have a thicker wall. Again, there is an ajcidium on G. pusillum which, according to Sydow, is probably also found on G. molle and G. rotundifolivm, and which belongs to Puccinia /'/'ygoni-Convolvuli ()âa form of P. Polygoni-amphibii which is often separated as a distinct species. The uredo- and teleuto- sori would, of course, not follow the secidium on the same plant in either of these two cases. On G. pyrenaicum there is another Uromyces (U. Kabatianus) which differs in the arrangement of its sori ; sec below. Distribution : Europe, except in the extreme South. 18. Uromyces Kabatianus Bubak. Uromyces Kabatianus Bubak, Sitz. kon. holme
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