. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 96 UROMYCES uredospores. The warts on the teleutospores are not numerous and are rather easy to see. Distribution -. North-western and Middle 11. Uromyces Ervi Westendorp. JHcidium Erm Wallr. FI. Crypt. Germ. ii. 247. Vromyces jErviWestd. Bull. Acad. Koy. Sci. Belg. xxi. pi. 2, p. 246, f. 3. Plowr. Ured. p. 140. Sydow, Monogr. ii. 96. Fischer, Ured. Sohweiz, p. 69, f. 53. ^cidiospores. ^cidia amphigenous, or on the petioles, solitary or 2—8 together in little scattered groups, cup-shaped, whitish; marg
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 96 UROMYCES uredospores. The warts on the teleutospores are not numerous and are rather easy to see. Distribution -. North-western and Middle 11. Uromyces Ervi Westendorp. JHcidium Erm Wallr. FI. Crypt. Germ. ii. 247. Vromyces jErviWestd. Bull. Acad. Koy. Sci. Belg. xxi. pi. 2, p. 246, f. 3. Plowr. Ured. p. 140. Sydow, Monogr. ii. 96. Fischer, Ured. Sohweiz, p. 69, f. 53. ^cidiospores. ^cidia 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 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 fjb, 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 /i or more thick), rounded or attenuated at the base, smooth, brown, 20—28 X 14—20 /x ; pedicels brownish, persistent, as long or twice as long as the spore. On leaves, petioles, and stems of Ervum hirsutiim (Vicia hirsuta). Jllcidia, 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 EEcidiospores are capable of reproducing the tecidium 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. F
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