22S 



PUCCINI A 



[JScidia on Geranium protease, G. silvaticum\\ uredo- and 

 teleutospores on Polygonum amphibium, I', lapathifolium, July- 

 October; nut uiieumnion. Klobnhn and Bubak report the 

 secidium oe G. /nolle, G. phaeum and other species. (Fig. L75.) 



Teleutospores are found not only in the separate sori described above, 

 but also in the <>ld uredo-sori. These latter spores arc rounded at the 

 apex ; those which grow in distinct sori often have the thickening cap 

 forced to one side, presumably by the pressure of the persistent epidermis. 

 For the distinctions of the tecidiuin of this Puccinia from that of Uromyces 

 Gt r'i mi which grows upon the same hosts, see under that species (p. 104). 



The proof of the connection of the secidium with the Puccinia was first 

 given byTranzschel in Russia, and has since been confirmed by Bubak. I 

 have not seen any British specimens of JScidium sanguinolentum ; the 

 description given above is taken from Lindroth. Similarly in Switzerland, 

 Fischer records only the uredo- and teleutospores. On Polygonum 

 amphibium they seem to be confined to the terrestrial form : I have never 

 seen them on the floating leaves. 



Distribution : World-wide. 



98. Puccinia Polygoni-Convolvuli DC. 



Puccinia Polygoni-amphibii Pers. ; Sydow, Monogr. i. 569 p.p. 



P. Polygoni-Convolvuli DC. Flor. fr. vi. 61. 



P. Polygoni Plowr. Ured. p. 188 p.p. Sacc. SylL vii. 63G p.p. 

 Fischer, Ured. Schweiz, p. 303, f. 221. 



Spermogones and jEcidia. Presumably similar to those of 



the preceding species. 



Uredospores. Sori hypophyllous, roundish, soon naked, 



brown ; spores ellipsoid to obovate, 

 echinulate, clear yellowish-brown, 24 — 

 30 x 15 — 20 /x, with two opposite 

 germ-pores. 



Teleutospores. Sori hypophyllous, 

 scattered, roundish, compact, pulvinate, 

 about \ mm. diani., soon naked and 

 pulverulent, black ; spores oblong to 

 clavate. rounded or occasionally conical 

 above and thickened (up to 8/a), faintly 

 constricted, gently attenuated below, 



smooth, brown, 32 — 45 x 18 — 21 fx : pedicels clear yellow-brown. 



persistent, nearly as long as the spore. 



Fig. 17G. P. Polygoni-Con- 

 volvuli. Teleutospores (ex 

 herb. Cooke). 



