. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POI'LAK 851 oval to ovate-oblong, 15—22x11—16/x ; opispore uniformly about 2 jx thick, with two germ-pores (?), echinulate all over; paraphyses distributed throughout the sorus, clavate, not capi- tate, 40—50 X 12—17 IX, with a uniformly thick wall (8—7/x).. Fig. 262. M. phdloy<inn (from a Gennan specimen, ex licrb. Sydow). a, a youn^ shoot of I'ine, in Juno, with newlj-fornied leaves, sliowing tliree CiEomata ((f), shaded ; the leaves have been removed from the affected portion, which is beginning to be
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POI'LAK 851 oval to ovate-oblong, 15—22x11—16/x ; opispore uniformly about 2 jx thick, with two germ-pores (?), echinulate all over; paraphyses distributed throughout the sorus, clavate, not capi- tate, 40—50 X 12—17 IX, with a uniformly thick wall (8—7/x).. Fig. 262. M. phdloy<inn (from a Gennan specimen, ex licrb. Sydow). a, a youn^ shoot of I'ine, in Juno, with newlj-fornied leaves, sliowing tliree CiEomata ((f), shaded ; the leaves have been removed from the affected portion, which is beginning to be curved; b, a cieoma, x 10; c, feeidio- spores; rf, old leaf of Aspen, showing numerous teleuto-sori on the lower surface; e, teleutospores. Teleutosporeii. Sori hypophyllous, mostly in clusters, about \ mm. wide, covered by the epidermis, crust-like, brown, not shining; spores prismatic, rounded at both ends, 20—85 x 7— 11 /x; epispore pale-brownish, scarcely 1 /u. thick, not thickened above, without evident germ-pore. Casomata on young shoots of Pinus silvestris which they distort. May, June; uredo- and teleutospores on Populus alba, P. tremida, and their hybrid (P. canescens), not on P. halsami- fera. Rare in this country. (Fig. 262.) The connection of the forms on the two hosts was first demonstrated by Rostrup and confirmed by Hartig and Klebahn. See p. 57. (8) Melampsora Rostrupii Wagner. Uredo conjluens DC. ; Cooke, Handb. p. 527 ; Micr. Fung. p. 216, pi. 7, f. 133, 134. Caeoma Mercurialis Link ; Plowr. Ured. p. 260. Sacc. Syll. vii. 868. Melampsora aecidioides Plowr. Ured. p. 241. Sacc. Syll. vii. 590. M. Hostrupii Wagner, in Oester. Bot. Zeitschr. 1890, xlvi. 273 Fischer, Ured. Schweiz, p. 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, William Bywater. Cambridge, Univ. Pre
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