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, 

 22 — 35x18 — 25/a; pedicels short, hyaline, 

 deciduous. 



On Geranium dissectum, G. 'mode, G. 



Teleutospores on G. pratense, G. pyrenaicum, G. silvaticum. 

 silvaticum. XT . „-, . ,. ■... , T 



JNot common, /hcidia, Marcn to June: 



beleutospores, June — October. (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. (q.v.). 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 (q.v.) — a 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 Gesell. Wissen. 1902, 

 p. 1, f. 1—5. Sacc. Syll. xvii. 249. Sydow, Monogr. ii. 194. 

 Fischer, Ured. Schweiz, p. 18, f. !.">. 

 Spermogones. Amphigenous, few, large, honey-coloured, 

 then darker, on the same spots as the a^cidia. 



yEcidiosporeft. ./Ecidia hypophyllous, on round yellowish 

 spots, in little clusters 2 — 4 mm. wide, hemispherical, opening 



