. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GRAMINE^ 275 elliptical or linear, reddish-brown, pulverulent, without para physes; spores subglobose or ovate, echinulate, brownish, 25— 35 X 20—25 iJL. Teleutospores. Sori similar, but larger (2—4 mm.), compact, pulvinate, black'; spores oblong, rounded at both ends, with a cap- like thickening (5—10 fi) above, plainly constricted, brown, 50— 60 X 20—23 /u,; pedicels brownish, thick, persistent, 75—100 /i long. -^cidia on Rumex Acetosa, May and June; uredo- and teleu- tospores on Pkragmites communis, from
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GRAMINE^ 275 elliptical or linear, reddish-brown, pulverulent, without para physes; spores subglobose or ovate, echinulate, brownish, 25— 35 X 20—25 iJL. Teleutospores. Sori similar, but larger (2—4 mm.), compact, pulvinate, black'; spores oblong, rounded at both ends, with a cap- like thickening (5—10 fi) above, plainly constricted, brown, 50— 60 X 20—23 /u,; pedicels brownish, thick, persistent, 75—100 /i long. -^cidia on Rumex Acetosa, May and June; uredo- and teleu- tospores on Pkragmites communis, from July. Rare. (Fig. 209.) The results of Plowright's cultures have been confirmed by Klebahn, but at any rate this species is very closely allied to the previous one, and should rather be considered as merely a biological race of it. Distribution. p. Trailii. Teleuto- spores, and sori on leaf of Pkrag- mites. Holland, Germany. 129. Puccinia Agrostidis Plowr. ^oidium AquUegiae Pers. ; Plowr. Ured. p. 263. ^. Ranunoulacearum var. AquUegiae DC. ; Cooke, Handb. p. 539. P. Agrostidis Plowr. Gard. Chronicle, 1890, ii. 139 ; Grevillea, xxi. 110. Sacc. Syll. xi. 202. Sydow, Monogr. i. 717. MoAlpine, Rusts of Australia, p. 114, f. 27 (?). Fischer, Ured. Schweiz, p. 353, f. 257. Spermogones. Honey-coloured, on round spots. JScidiospores. Mci^ia, on rather large roundish yellow spots which are often thickened and margined with brown, crowded, hypophyllous, shortly cylindrical, with a torn white margin; spores faintly verruculose, orange, 16—30 x 14—20/i. Uredospores. Sori amphigenous, on yellow spots, elongated or linear, about 1 mm. long, bright-orange; spores globose to 18—2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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