. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GENTIANA 179. Fig. 128. P. Gentianae. Teleutospore, mesospore, and uredospore, on G. acaulis. aculeolate, brownish-yellow, 20—30 x 18—24 fi, with two, rarely three, germ-pores. Teleutospores. Sori similar and also on the stems, but pulverulent and black-brown; spores ellipsoid to ovoid, rounded at both ends, not thickened above, but some- times with a low broad papilla, not constricted, smooth, dark- chestnut, 28—38 X 24—30 fj,; pedicels hyaline, thin, rather long, very deciduous; occa- sionally there are a
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GENTIANA 179. Fig. 128. P. Gentianae. Teleutospore, mesospore, and uredospore, on G. acaulis. aculeolate, brownish-yellow, 20—30 x 18—24 fi, with two, rarely three, germ-pores. Teleutospores. Sori similar and also on the stems, but pulverulent and black-brown; spores ellipsoid to ovoid, rounded at both ends, not thickened above, but some- times with a low broad papilla, not constricted, smooth, dark- chestnut, 28—38 X 24—30 fj,; pedicels hyaline, thin, rather long, very deciduous; occa- sionally there are a few mesospores intermixed. On Gentiana acaulis. Uredo- and teleutospores, Kew Gardens, August, 1905 (M. C. Cooke), and Horsham (W. G. Smith). (Fig. 128.) I have a specimen on O. Andrewsii, from the United States, with exactly similar teleutospores. The secidia are said to appear in April and June, and more frequently on the stems and peduncles than on the leaves. Jaczewski's JEddium was on calyx, stem and leaf of O. angustifolia, on pale orange spots. Distribution : Europe, Siberia, East Indies, North America. 51. Puccinia Primulas Duby. JScidium Frimulae DC. Flor. fr. vi. 90. Cooke, Handb. p. 544 ; Micr. Fung. p. 199. Uredo Primulae DC. Flor. fr. vi. 68. Trichohasis Primulae Cooke, Micr. Fung. p. 227. Puccinia Primulae Duby, Bot. Gall. ii. 891. Cooke, Handb. p. 495 ; Micr. Fung. p. 204. Plowr. Ured. p. 159. Saoc. Syll. vii. 612. Sydow, Monogr. i. 348. Fischer, Ured. Schweiz, p. 161, f. 124. JEcidiospores. ^cidia hypophyllous, on yellowish spots,, densely but irregularly clustered in roundish groups, shortly cylindrical, with a broad much cut revolute white margin; spores verruculose, orange, 17—23 x 12—18 /u,. 12—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)
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