. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON RUBIACE^ 165 ^cidiospores. ^cidia hypophyllous, scattered or collected in orbicular clusters on roundish or oblong paler spots, shortly cylindrical, with a short white recurved margin; spores globose or broadly ellipsoid, orange-yellow, somewhat smooth, 16—23/i. Uredospores. Sori hypophyllous, minute, roundish, on the stems linear, reddish-brown, often confluent; spores globose to ovate, aculeolate, pale-brown, 22—30 x 17—23/u-, with two or three Fip. 11-5. p. punctata. Teleutospores; a, on G. s
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON RUBIACE^ 165 ^cidiospores. ^cidia hypophyllous, scattered or collected in orbicular clusters on roundish or oblong paler spots, shortly cylindrical, with a short white recurved margin; spores globose or broadly ellipsoid, orange-yellow, somewhat smooth, 16—23/i. Uredospores. Sori hypophyllous, minute, roundish, on the stems linear, reddish-brown, often confluent; spores globose to ovate, aculeolate, pale-brown, 22—30 x 17—23/u-, with two or three Fip. 11-5. p. punctata. Teleutospores; a, on G. saxatile ; h, on G. palustrc ; c, on G. verum. Teleutospores. Sori similar, but black, compact, and per- sistent ; spores ellipsoid to clavate, truncate, rounded or coni- cally attenuate above, where they are much thickened (up to 14 yu,), and often darker, slightly constricted, tapering below, brown, smooth, 30—56 x 14—24/x; pedicels brownish above, persistent, thick, about as long as the spore; a few mesospores occasionally. On leaves and stems of Galium Cruciata (?), G. Mollugo, G. palustre, G. saxatile, G. uliginosum, G. verum. Not uncom- mon. iEcidia, June; teleutospores, August and September. (Fig. 115.) The forms of P. ptmctata on these various species of Galium differ considerably in the shape and size of the teleutospores, and have been divided into several biological races. On G. Aparine there is a distinct species, P. difformis () ; but it is possible that P. punctata also occurs. 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. Press
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