. The British rust fungi (Uredinales) their biology and classification. Rust fungi. COLEOSPORIUM 323. Teleutospores. Sori filling large intercellular spaces of the mesophyll towards the lower sur- face of the leaf; spores prismatic, length up to 140/x, breadth 18— 28 fj,; epispore 18—21 fj, thick, or more, at the summit. ^cidia on (?both) leaves of Pinus silvestris; uredo- and teleu- tospores on Tussilago Farfara, May—November, very common. (Fig. 243.) The connection of the spore-forms on the alternate hosts has been demon- strated by Plowright, Klebahn, Fischer and Wagner. Klebahn and Fischer
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. COLEOSPORIUM 323. Teleutospores. Sori filling large intercellular spaces of the mesophyll towards the lower sur- face of the leaf; spores prismatic, length up to 140/x, breadth 18— 28 fj,; epispore 18—21 fj, thick, or more, at the summit. ^cidia on (?both) leaves of Pinus silvestris; uredo- and teleu- tospores on Tussilago Farfara, May—November, very common. (Fig. 243.) The connection of the spore-forms on the alternate hosts has been demon- strated by Plowright, Klebahn, Fischer and Wagner. Klebahn and Fischer showed moreover that the parasite can- not be transferred to Fetasites or Sonchus. Plowright produced the aecidia (P. Plowrightii) on leaves of Scots Pine from the Coleosporium on Tussilago (experiment 1243), 25th May, 1899. His specimens show the peridia, in almost every case, on both leaves of the fascicle. The same is true of the following experiment by Blackman : In October, 1904, he tied leaves of Coltsfoot bearing germinating teleuto- spores of C. Tussilaginis on four trees of P. dlvestris at Crockham Hall, Kent. On April 14th, 1905, the beginnings of spermogones and eecidia were visible in three cases on neighbouring needles, but nowhere else. In June, 1905, all four showed the Peridermimn. Specimens in Herb. Kew. The uredospores are often very densely and rather coarsely verruculose, but also occasionally smooth either wholly or in parts ; in fact the warts are deciduous and may disappear entirely. Distribution: Europe. Fig. 243. C. Tussilaginis. jEcidia on both leaves of a fascicle of P. silvestris (from Blackman's experiment), reduced ; uredo- and young teleutospore x 600. 3. Coleosporium Petasitis Lev. Coleosporium Petasitis L^v. Ann. Sci. Nat. 1847, p. 373. Cooke, Handb. p. 521; Micr. Fung. p. 217. Fischer, Ured. Schweiz, p. 450. C. Sonchi Plowr. Ured. p. 250 Sacc. Syll. vii'. 752 Peridermium Boudieri Fischer, Contrib. ^tude du genre Coleosporium, i
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