. The British rust fungi (Uredinales), their biology and classification. Uredineae. UROMYCES 87 The uredospore« seem to be variable in tlieir marlcings ; some are distinctly verrucose with pointed warts ; others are as distinctly echinulate. Distribution : Europe and South Africa. 2. Uromyces Scrophulariae Fckl. jEcidium Scrophulariae DC. ; Cooke, Handb. p. 54-4 ; Micr. Fung. p. 199. Uromyces Scrophulariae Fckl. Symb. 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. Spennogo
. The British rust fungi (Uredinales), their biology and classification. Uredineae. UROMYCES 87 The uredospore« seem to be variable in tlieir marlcings ; some are distinctly verrucose with pointed warts ; others are as distinctly echinulate. Distribution : Europe and South Africa. 2. Uromyces Scrophulariae Fckl. jEcidium Scrophulariae DC. ; Cooke, Handb. p. 54-4 ; Micr. Fung. p. 199. Uromyces Scrophulariae Fckl. Symb. 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. Spennogones. Few, singly or in little groups, simul- taneously with the secidia. AUcidiospores. ^^i^cidia 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, smouth below, yellowish, 18—21 xl4—18y[i. 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 6 /u-), with a dark-coloured tenuated below, smooth, brown, 18—35 x 11—18/i.; pedicels persistent, hyaline or yellowish, nearly as long as the spore. On leaves, petioles and stems of Scrophidaria ctquatica, &. nodosa. July—September. Not common. (Fig. 39.) The spots on the leaves are pallid, edged with violet-brown. The teleutospores especially caiise considerable distortion of the leaves and stems. The two kinds of spores may be produced on the same mycelium, and the £ecidia 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
Size: 1907px × 1310px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1913
