. The British rust fungi (Uredinales), their biology and classification. Uredineae. 96 UROMYCES uredospores. The warts on the teleutospores are not and are rather easy to see. Distribution : North-western and Middle Europe. 11. Uromyces Ervi Westendorp. jEcidium Ervi WaUr. Fl. Crypt. Germ. ii. 247. Uromijces Ervi Westd. Bull. Acad. Hoy. Sci. Belg. xxi. pt. 2, p. 246, f. 3. Plowr. Ured. p. 140. Sydow, Monogr. ii. 96. Fischer, Ured. Schweiz, p. 69, f. 53. ^-Ecidiospores. MciAva amphigenous, or on the petioles, solitary or 2—8 together in little scattered groups, cup-shaped, whitish; m
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 96 UROMYCES uredospores. The warts on the teleutospores are not and are rather easy to see. Distribution : North-western and Middle Europe. 11. Uromyces Ervi Westendorp. jEcidium Ervi WaUr. Fl. Crypt. Germ. ii. 247. Uromijces Ervi Westd. Bull. Acad. Hoy. Sci. Belg. xxi. pt. 2, p. 246, f. 3. Plowr. Ured. p. 140. Sydow, Monogr. ii. 96. Fischer, Ured. Schweiz, p. 69, f. 53. ^-Ecidiospores. MciAva 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/x. Uredospores. Sori rarely formed, amphigenous or on the petioles and stems, scattered, minute, ob- long, surrounded by the ruptured epidermis, cinnamon; spores ovate or ellipsoid, dis- tantly echinulate, brownish-yellow, 20 — 30 X 18—22 fl, 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 yu, or more thick), rounded or attenuated at the base, smooth, brown, 20—28 X 14—20 jji; pedicels brownish, persistent, as long or twice as long as the spore. On leaves, petioles, and stems of Ervum hirsutmn (Vicia hirsuta). ^cidia. 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 fecidiospores are capable of reproducing the fecidium 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,
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