. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 344 'SOKA. Spermogones. Hardly projecting, flat, mostly under the stomata. JEcidiospores. Cseoraata irregular in outline, clustered or circinate oe large pale-yellowish spots, often confluent, 1—2 mm. diam.; bright orange- yellow: spores roundish-polygonal, 11—20 x 11—15 jx\ epispore very thin, delicately warted. Uredospores. Sori hypophyllous, minute, deep-orange, causing yellow spots on the upper side: spores more or less round, orange, echmulate, 13—17x12—14 /x; paraphyses mostly capi
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 344 'SOKA. Spermogones. Hardly projecting, flat, mostly under the stomata. JEcidiospores. Cseoraata irregular in outline, clustered or circinate oe large pale-yellowish spots, often confluent, 1—2 mm. diam.; bright orange- yellow: spores roundish-polygonal, 11—20 x 11—15 jx\ epispore very thin, delicately warted. Uredospores. Sori hypophyllous, minute, deep-orange, causing yellow spots on the upper side: spores more or less round, orange, echmulate, 13—17x12—14 /x; paraphyses mostly capitate, with thin pedicels, 40— 70 xlG—20 fi. Teleutospores. Sori hypophyllous or a few on the upper side, subepidermal, small, dark-brown; spores prismatic, rounded at both ends, 16—48x7—14/a: epispore clear-brown, uniformly thin (about 1 p), without any evident germ-pore. < 'n'omata on IAstera ovata, Orchis latifolia, 0. unirnlata, May, June: uredo- and teleutospores on Salix aurita, S. repens. Not common. (Fig. 259.) The cseorna is also recorded on Listera cordata, Goodyera repens, and Gymnadenia conopsea, but no experimental proof of the connection seems to be forthcoming in the case of these species, though both Plowright and Klebahn have demonstrated it for the other species. The teleutospores germinate, as usual, after the winters rest. Soppitt found the cajoma on 0. maculata and the teleutospores on S. repens growing together near Southport.—The secidium of Puecinia Orchidearum-Pkalaridis can be readily distinguished from the ca?oma of this species by its evident peridium and the regularity of its form. repentis. Caeoma on leaf of Listera oratit. from one of Plowright's cul- tures (reduci d). Melampsora Allii-fragilis Kleb. Uredo Alliorum DC. ; Cooke, Micr. Fung. p. 217 Cm-oiiw Alliorum Link; Plowr. Fred. p. 261 Melampsora Vitellinae Plowr. p. 240 M. Allii-fragilis Kleb. in Pringsh. Jahrb. f. Wissensch. Bot. 1
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