ON POLYGONACEE 117 
On the same host-plants is a Puccinia, which (in the absence of the 
teleutospores) can be distinguished only by the fact that the uredospores 
have two (rarely three) germ-pores and are adorned with few and distant 
spines. There is little doubt that many of the specimens recorded as 
U. Acetosae are really the uredospores of Puccinia Acetosae. 
DISTRIBUTION : Germany, France, Sweden, Norway, Finland. 
29. Uromyces Polygoni Fckl. 
Aicidium aviculariae Kze.; Cooke, Handb. p. 545; Micr. Fung. p. 199. 
Puceinia vaginalium Link; Cooke, Handb. p. 495; Micr. Fung. 
p. 204. 
Trichobasis Polygonorum Berk.; Cooke, Micr. Fung. p. 226 p.p. 
Uromyces Polygont Eckl. Symb. Myce. p. 64. Cooke, Handb. p. 519 ; 
Micr. Fung. p. 213, Plowr. Ured. p. 123. Sacc. Syll. vil. 533. 
Sydow, Monogr. ii. 236. Fischer, Ured. Schweiz, p. 61, f. 46. 
McAlpine, Rusts of Australia, p. 99, f. 150—1. 
Spermogones. Honey-coloured, conical, only a few together. 
Aicidiospores. Mostly hypophyllous, on yellow or violet 
spots, irregularly aggregated or in circular groups, cup-shaped, 
whitish, with a cleft and revolute margin; spores verruculose, 
yellowish, 15—21 x 14—18 yp. 
Uredospores. Sori amphigenous or on the stems, scattered 
or in small clusters, small, round, soon 
naked, pulverulent,.cinnamon ; spores glo- 
bose to ellipsoid, densely and minutely 
verruculose, pale-brown, 18—26 x 17—24u; 
epispore 1424 » thick, with three or four 
germ-pores. 
Teleutospores. Sori like the uredo- 
sori, but larger and more confluent upon fig 69, Uv. Polygoni. 
the stems, compact, dark-brown; spores Teleutospores, on P. 
aviculare. 
globose or obovate, rounded above and 
thickened (up to 6), smooth, chestnut-brown, 22—38 x 14— 
22 w; pedicels coloured, persistent, thick, as much as 90 wu long. 
On Polygonum aviculare. Aicidia, rare, May—June, Man- 
chester (T. Brittain), 1875; uredo- and teleutospores, very 
common, July—November. (Fig. 69.) 
