. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON GENTIANA 179. Fig. 128. P. Gentianae. Teleutospore, mesospore, and medospore, on G. acaulis. aculeolate, brownish-yellow, 20—30 x 18—24 /x, 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 p; pedicels hyaline, thin, rather long, very deciduous; occa- sional
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON GENTIANA 179. Fig. 128. P. Gentianae. Teleutospore, mesospore, and medospore, on G. acaulis. aculeolate, brownish-yellow, 20—30 x 18—24 /x, 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 p; 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 67. Andrewsii, from the United States, with exactly similar teleutospores. The aecidia are said to appear in April and June, and more frequently on the stems and peduncles than on the leaves. Jaczewski's JEcidium was on calyx, stem and leaf of 67. angustifolia, on pale orange spots. Distribution : Europe, Siberia, East Indies, North America. 51. Puccinia Primulae Duby. JEcidium Primulae DC. Flor. fr. vi. 90. Gooke, Handb. p. 544 ; Micr. Fung. p. 199. Uredo Primulae DC. Flor. fr. vi. 68. Trichobasis Primulae Cooke, Micr. Fung. p. 227. Puccinia Primulae Duby, Bot. Call. ii. 891. Cooke, Handb. p. 495 ; Micr. Fung. p. 204. Plowr. Ured. p. 159. Sacc. Syll. vii. 612. Sydow, Monogr. i. 348. Fischer, Ured. Schweiz, p. 161, f. 124. sEcidiosjjores. iEcidia 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—23x12—18 fx. 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. (
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