96 UROMYCES 
uredospores. The warts on the teleutospores are not numerous and are 
rather easy to see. 
DistriBuTION: North-western and Middle Europe. 
11. Uromyces Ervi Westendorp. 
Heidium Ervi Wally, Fl. Crypt. Germ. ii. 247. 
Uromyces Ervi Westd. Bull. Acad. Roy, Sci. Belg. xxi. pt. 2, p. 246, f. 3. 
Plowr. Ured. p. 140, Sydow, Monogr. ii. 96. Fischer, Ured. 
Schweiz, p. 69, f. 53. 
Acidiospores. Aicidia amphigenous, or on the petioles, 
solitary or 2—8 together in little scattered groups, cup-shaped, 
whitish ; margin faintly revolute, scarcely torn; spores densely 
and minutely verruculose, pale-yellowish, 16—25 x 14—18 y. 
Uredospores. Sori rarely formed, amphigenous or on the 
petioles and stems, scattered, minute, ob- 
long,surrounded by theruptured epidermis, 
cinnamon ; spores ovate or ellipsoid, dis- 
tantly echinulate, brownish-yellow, 20— 
30 x 18—22 w, with two (rarely three) 
germ-pores. 
; Leleutospores. Sori amphigenous, or 
Fig. 48. U. Ervi, Leaf - 
of E. hirsutwn, with ™ore frequently on the petioles and stems, 
pall slightly en- scattered, minute, oblong, surrounded by 
arged; two teleuto- : a 3 
spores. the ruptured epidermis, blackish-brown ; 
= spores subglobose to obovate, usually 
darker and rounded above (where the wall is up to 8 w or more 
thick), rounded or attenuated at the base, smooth, brown, 
20—28 x 14—20 4; pedicels brownish, persistent, as long or 
twice as long as the spore. 
On leaves, petioles, and stems of Hrvum hirsutum (Vicia 
hirsuta). Acidia, May—October; teleutospores from July 
onwards, lasting through the winter on the dead stems. (Fig. 48.) 
It has been proved by many culture experiments that Plowright was 
correct in his belief that this species is strictly confined to the one host. 
The aecidiospores are capable of reproducing the ecidium and are found 
throughout the season ; the uredospores are, perhaps in consequence, not 
abundant, only a few being occasionally found and usually intermixed 
with teleutospores. 
DisTRIBUTION: Europe, Japan. 
