. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 202 I'l ( < INI \ experimentally proved by De Bary andJacky. Bock (Centralbl. fiir Bakt. •_'. x.\. 586) showed that what appeared to be identical with /'. Violae could also !"• artificially produced on I', comma, V. Intra, I', tricolor; the secidia formed small or Large crowded well-defined groups, and thereby differed from those of /'. aegra which spread widely over the stems and leaves of their hosts, mostly standing alone and not collected in groups. In the latter, moreover, secidia
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 202 I'l ( < INI \ experimentally proved by De Bary andJacky. Bock (Centralbl. fiir Bakt. •_'. x.\. 586) showed that what appeared to be identical with /'. Violae could also !"• artificially produced on I', comma, V. Intra, I', tricolor; the secidia formed small or Large crowded well-defined groups, and thereby differed from those of /'. aegra which spread widely over the stems and leaves of their hosts, mostly standing alone and not collected in groups. In the latter, moreover, secidia and teleutospores can be found in July at the same time (or even on the same leaf), which is not usually the case with /'. Violae. This species can attack cultivated violets, but rarely does much harm ; burning the infected plants is a sufficient remedy. Distribution : World-wide, except Australia. 74. Puccinia aegra Grove. .Eciih'nm (lau{jcra>ix\T\, Gard. Ghron. Is7 pp. Cooke, Micr. Fung. p. 195 ; Grevillea, v. 57. Puccinia argra Grove, Journ. Bot. xxi. (1883) p. 274. p. 158. Sacc. Syll. vii. 614. P. depauperans Sydow, Monogr. i. 442 (1903). 175, 361, 437. Plowr. Ured. Uredospores. JEcidiospores. ^Ecidia on all green parts of the host, particularly on the stems, not in clusters, but spread pretty uniformly over the whole surface, especially of the stems which are swollen and distorted, cup-shaped, with a white torn revolute margin; spores globose to ellipsoid, smooth, orange, 17—21 x 14—16 fx. Sori amphigenous, without spots, irregularly scattered or aggregated, occasionally confluent, long covered by the lead- coloured epidermis, cinnamon; spores globose to ellipsoid, delicately echinu- late, brownish 20—28 /x diam. Teleutospores. Sori similar, but darker; spores ellipsoid or ovoid, rounded or gently attenuated above, where it is slightly thickened or rather surmounted by a minute subhyaline papilla, hardly constricted, usually rounded below, very delicately p
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