100 UROMYCES 
U. Pist Winter, Krypt. Flor. i. 163. Cooke, Grevillea, vii. 135. Plowr. 
Ured. p. 188. Sacc, Syll. vii. 542 p.p. Sydow, Monogr. ii. 124. 
Fischer, Ured. Schweiz, p. 28, f. 22. 
Spermogones. Hypophyllous, numerous, scattered amongst 
the secidia. 
Aicidiospores. Aicidia distributed uniformly over the lower 
surface of the leaf, cup-shaped, with a white, torn, broadly 
revolute margin; spores densely and minutely verruculose, 
orange, 18—23 py. 
Uredospores. Sori generally hypophyllous, scattered, minute, 
soon naked, pulverulent, cinnamon; spores 
, : globose or subglobose, minutely verruculose, 
fi ! yellow-brown, 21—25 yw diam.; epispore 14— 
8 E 24 thick, with 3—5 germ-pores. 
ne Teleutospores. Sori similar, but sometimes 
confluent and larger, dark-brown; spores sub- 
ae he as globose to ovate, with a small hyaline papilla 
spermogoneson (as much as 3m high), everywhere minutely 
leaf of Euphor- FT her a ] l ti 20 
bia Cyparissias 2d rather densely verruculose, brown, 20— 
ee 28 x 14—22 #3 epispore 1} thick; pedicels 
hyaline, short, deciduous. 
Acidia on Euphorbia Cyparissias, May, June; uredo- and 
teleutospores on Piswm sativum and Lathyrus pratensis, July— 
September. Rare. (Fig. 54.) 
Although both will equally infect 2. Cyparissias, it is probable that 
the Uromyces on Pisum is biologically distinct from that on Lathyrus. It 
is not certain that the latter has been found in this country, but the 
former is recorded from various places. It must be remembered that 
U. Fabae occurs also on the same two genera, though all the spore-forms 
of the two can be easily distinguished. 
An ecidium on £. Cyparissias, and attributed to U. Pis?, was found 
at Dover, May, 1909 (Rev. T. Taylor); the specimen is in the British 
Museum, but there is no proof that this belonged to U. Pisz, because it 
has been shown that U. Loti, U. striatus (both of which are British), as 
well as two other (non-British) species, equally produce on EZ. Cyparissias 
wcidia which are norphologically indistinguishable. This acidium pos- 
sesses a perennial mycelium, which permeates the whole host and deforms 
and. bleaches it. The connection of one form of it with Uromyces Pist 
has been experimentally demonstrated by Schroter, Rostrup, Fischer and 
others. The Uromyces on Vicia Cracca which was formerly considered to 
