228 PUCCINIA 
[Acidia on Geranium pratense, G. silvaticum ;] uredo- and 
teleutospores on Polygonum amphibium, P. lapathifolium, July— 
October; not uncommon. Klebahn and Bubdk report the 
ecidium on G. molle, G. phaeum and other species. (Fig. 175.) 
Teleutospores are found not only in the separate sori described above, 
but also in the old uredo-sori. These latter spores are 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 ecidium of this Puccinia from that of Uromyces 
Geranii which grows upon the same hosts, see under that species (p. 104). 
The proof, of the connection of the zcidium with the Puccinia was first 
given by Tranzschel in Russia, and has since been confirmed by Bubak. I 
have not seen any British specimens of Meidium 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. 
Puceinia Polygont-amphibii Pers. ; Sydow, Monogr. i. 569 p.p. 
P. Polygoni-Convolvult DC. Flor. fr. vi. 61. 
P. Polygont Plowr. Ured. p. 188 p.p. Sace. Syll. vii. 636 p.p. 
Fischer, Ured. Schweiz, p. 303, f. 221. 
Spermogones and dicidiu. Presumably similar to those of 
the preceding species. 
Uredospores. Sori hypophyllous, roundish, soon naked, 
brown; spores ellipsoid to obovate, 
echinulate, clear yellowish-brown, 24— 
Co 30 x 15-20 w, with two opposite 
germ-pores. 
Teleutospores. Sori hypophyllous, 
scattered, roundish, compact, pulvinate, 
about 4mm. diam., soon naked and 
pulverulent, black; spores oblong to 
F eae, iaeaee clavate, rounded or occasionally conical 
herb. Cooke). vbove and thickened (up to 8), faintly 
constricted, gently attenuated below, 
smooth, brown, 32—45 x 18—21 w; pedicels clear yellow-brown, 
persistent, nearly as long as the spore. 
