. The British rust fungi (Uredinales), their biology and classification. Uredineae. 212 PUCCINIA. 82. Puccinia Ribis DC. Puceinia Ribis DC. Flor. fr. ii. 221. Gard. Chron. 1894, xvi. 135. Trans. Brit. Myc. Soc. i. 57. Sacc. Syll. vii. 679. Sydow, Monogr. i. 496. Teleutospores. Sori epiphyllous, orbicular, surrounded by a discoloured yellow zone, circinate and often confluent, pulverulent, rich chestnut-brown ; spores oval or oblong, rounded above and be- low, apex thickened slightly and hooded, hardly constricted, verru- culose or rather punctate, chest- nut-brown, 20—30 X 15—20 fi; pedicels h
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 212 PUCCINIA. 82. Puccinia Ribis DC. Puceinia Ribis DC. Flor. fr. ii. 221. Gard. Chron. 1894, xvi. 135. Trans. Brit. Myc. Soc. i. 57. Sacc. Syll. vii. 679. Sydow, Monogr. i. 496. Teleutospores. Sori epiphyllous, orbicular, surrounded by a discoloured yellow zone, circinate and often confluent, pulverulent, rich chestnut-brown ; spores oval or oblong, rounded above and be- low, apex thickened slightly and hooded, hardly constricted, verru- culose or rather punctate, chest- nut-brown, 20—30 X 15—20 fi; pedicels hyaline, thin, deciduous, about as long as the spore; a few mesospores intermixed. On leaves of Ribes ruhrmn. Very rare. Dallas Manse Garden, Elginshire, July 16, 1894 (Rev. Dr Keith). (Fig. 159.) The pore of the lower cell is always towards the base, near the insertion of the pedicel. Eriksson showed that the teleutospores do not germinate until they have passed through the winter. He considers the form on Rihes rxibrum as biologically distinct from that on R. nigrum or R. ii rossularia. Distribution : Central and Northern Europe, North America. Fig. 159. P. Ribis. Teleutospores and mesospore. 83. Puccinia Saxifragae Schlecht. Puccinia Saxifragae Schlecht. Flor. Berol. ii. 134. Plowr. Ured. p. 208. Sacc. Syll. vii. 678. Sydow, Monogr. i. 500. Fischer, Ured. Schweiz, p. 151, f. 117. P. Saxifragarum Cooke, Micr. Fung. p. 209 {non Handb. p. 506). Teleutospores. Sori generally hypophyllous, on discoloured spots, round, scattered or aggregated and confluent and then irregular, soon naked, pulverulent, dark-brown; spores ellipsoid or oblong, rounded at both ends or slightly attenuated below, slightly constricted, often surmounted by a rather large pale. 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, Wi
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