ON GERANIACE 105 
by a pore; spores roundish-polygonal to oblong-ovate, densely 
verruculose, yellow, 24—33 x 18—26 pu. 
Uredospores. Sori hypophyllous, on yellow spots, in circi- 
nate groups, seldom scattered, rather large, pulverulent, choco- 
late-brown ; spores roundish, brown, distantly echinulate, 22— 
26 «; epispore about 2 w thick. 
Leleutospores. Sori hypophyllous, on yellowish or reddish 
QVC 
Fig. 58. U. Kabatianus. Teleutospores and uredospore, on G. pyrenaicum. 
spots, rather large, covered with the thin silvery-shining epi- 
dermis, generally in circinate groups, soon confluent, pulverulent, 
brown; spores ovate, often oblong, scarcely thickened above, . 
but with the germ-pore provided with a prominent subhyaline 
papilla (up to 7 » high), smooth, pale-brown, 22—42 x 183—20 w; 
pedicels short, hyaline, deciduous. 
On Geranium pyrenaicum, and possibly on G. molle and 
G. pusillum. (Fig. 58.) 
This has been separated by Bub4k from U. Geranii on the ground of 
the circinate arrangement of the uredo- and teleuto-sori, and the more 
oblong and longer teleutospores : the description of the ewcidia and teleu- 
tospores is taken from that of Bubdék. According to Sydow, Lind has 
succeeded in transferring this species from G. pyrenaicum to G. molle and 
G. pusiilum. Bub&k thought that only this form occurred on G. pyrenat- 
cum, but Bock (Centralbl. f. Bakt. 2, xx. 584) showed that typical 
Uromyces Geranii could also be produced on that host. 
The two Uromyces are very closely allied, but several distinctions are 
alleged: the uredospores themselves are identical, but not the sori ; 
according to Sydow. the teleutospores of U. Aabatianus do not appear till 
towards the end of October, are paler, longer and more oblong in shape 
with a higher papilla, while their sori are generally circinate, paler and 
less compact. The teleutospores of U. Geranit appear at the beginning of 
summer, the sori are nearly black, rather compact, and more scattered. 
I have specimens collected at Cambridge in August, on G. pyrenazcum, 
having the uredo-sori in circinate groups on conspicuous yellow spots, and 
