96 



UROMY< ES 



uredospores. The warts on the teleutospures are not numerous and are 

 rather easy to see. 



Distribution: North-western and Middle Europe. 



11. Uromyces Ervi Westendorp. 



/Ecidium Ervi Wallr. Fl. Crypt. Germ. ii. 2J7. 



Uromyces ErviWesid. Bull. Acad. Roy. Sci. Belg. x.xi. pt. 2, p. 246, f. '■',. 



Plowr. Qred. p. 140. Sydow, Monogr. ii. !)<;. Fischer, Qred. 



Schweiz, p. 69, f. 53. 



/Eddiospores. zEcidia 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 — l<Syu.. 

 Uredospores. Sori rarely formed, amphigenous or on r h'- 

 petioles and stems, scattered, minute, ob- 

 long, >unounded by the ruptured epidermis, 

 cinnamon ; spores ovate or ellipsoid, dis- 

 tantly echinulate, brownish-yellow, 20 — 

 30x18 — 22^, with two (rarely three) 

 germ-pores. 



Teleutospores. Sori amphigenous, or 

 more frequently on the petioles and stems, 

 scattered, minute, oblong, surrounded by 

 the ruptured epidermis, blackish-brown ; 

 spores subglobose to obovate, usually 

 darker and rounded above (where the wall is up to 8 /j, or more 

 thick), rounded or attenuated at the base, smooth, brown. 

 20 — 28x14 — 20 /la; pedicels brownish, persistent, as long or 

 twice as long as the spore. 



On leaves, petioles, and stems of Ervum hirsatum ( Vicia 

 hirsuta). /Ecidia, 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 secidiospores ait- capable of reproducing the secidium 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. 



Fig. 48. U. Ervi. Leaf 

 of E. hirsutum, with 



fficidia, slightly en- 

 larged ; two teleuto- 

 spores. 



