. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. UROMYCES 87 The uredospores seem to be variable in their markings ; some are distinctly verrucose with pointed warts ; others are as distinctly echinulate. Distribution : Europe and South Africa. 2. Uromyces Scrophulariae Fckl. JEtidium Scrophulariae DC.; Cooke, Handb. p. 544 ; Micr. Fung. p. 199. Uromyces Scrophulariae Fckl. Syrnb. Myc. p. 63. Plowr. Ured. p. 139. Sacc. Syll. vii. 559. Sydow, Monogr. ii. 27. Fischer, Ured. Schweiz, p. 75, f. 56. V. concomitans B. et Br. ; Cooke, Micr. Fung. p.
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. UROMYCES 87 The uredospores seem to be variable in their markings ; some are distinctly verrucose with pointed warts ; others are as distinctly echinulate. Distribution : Europe and South Africa. 2. Uromyces Scrophulariae Fckl. JEtidium Scrophulariae DC.; Cooke, Handb. p. 544 ; Micr. Fung. p. 199. Uromyces Scrophulariae Fckl. Syrnb. Myc. p. 63. Plowr. Ured. p. 139. Sacc. Syll. vii. 559. Sydow, Monogr. ii. 27. Fischer, Ured. Schweiz, p. 75, f. 56. V. concomitans B. et Br. ; Cooke, Micr. Fung. p. 213. Spermogones. Few, singly or in little groups, simul- taneously with the secidia. JUcidiospores. zEcidia hypophyllous or on the stems, on yellowish spots, in rounded clusters or in more or less elongated patches on the nerves and stems, cup-shaped, yellowish ; margin involute, entire; spores verruculose, smooth below, yellowish, 18—21 x 14—18/*. Teleutospores. Sori small and roundish, arranged like the secidia except that they form more elongated groups (as much as 10 cm. long) on the stems, long- covered by the lead-coloured epider- mis, at length naked and pulverulent. dark-brown; spores very irregular, obovate, fusiform, or ellipsoid, angu- lar, rarely sub-globose, apex rounded, truncate or slightly pointed, some- what thickened (up to (5 /j,), with tenuated below, smooth, brown, 18—35x11—18^; pedicels persistent, hyaline or yellowish, nearly as long as the spore. On leaves, petioles and stems of Scroph ularia aquatica, S. nodosa. July—-September. Not common. (Fig. 39.) The spots on the leaves are pallid, edged with violet-brown. The teleutospores especially cause considerable distortion of the leaves and stems. The two kinds of spores may be produced on the same mycelium, and the secidia and teleuto-sori can occur simultaneously and intermixed, or the latter surrounding the former (Grevillea, iii. 181, pi. 36). For this. Fig. 39. U. Scrophulariae. Teleutospor
Size: 1906px × 1311px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1913
