314 CRONARTIUM 
C. flaccidum Wint. Pilze, i. 236 (1884). Plowr. Ured. p. 254. Sace. 
Syll. vii. 598. 
Peridermium Cornut Keb. Zeitschr. f. Pllanzenkr. 1892, ii. 269, pl. 5, 
f. 2. 
Aieidiospores. Aicidia (P. Cornut) erumpent from the bark, 
forming large reddish-yellow bladders, generally occupying a 
portion of a branch in large numbers; spores ellipsoid, 22—26 
x 16—20 4; epispore 3—4 yw thick, verrucose, thinner on part 
‘of its surface and there smooth or somewhat reticulate. 
Uredospores. Sori small, pustular, surrounded by a peridium 
which opens at the summit with a pore; spores ellipsoid or 
ovate, sparsely echinulate, 21—24 x 17—21 p. 
Fig. 238. C. asclepiadeum. a, Peridermium Cornui on branch of Pine; 
b, teleuto-sori on leaf of Peony (reduced); ev, uredospore x 600; d, part 
of a column of teleutospores x 300. 
Teleutospores. Sori cylindrical, often curved, arranged in 
large clusters, over 1 mm. high, brown, at length horny, 
compact; spores ellipsoid or cylindrical-oblong, reaching 56 u 
long and 14 ~ broad; epispore thin, slightly thicker above. 
fKcidia on the branches of Pinus silvestris, May, June; 
uredo- and teleutospores on Paeonia officinalis in gardens, 
July—October. Very uncommon. (Fig. 288.) 
It has been proved by the researches of Cornu, Klebahn, Fischer and 
many others, not only that the remarkable ecidia on Pine are genetically 
connected with the other spore-forms on Peony, but also that they can 
