. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON COMPOSITE 149 On Hypochoeris radicata. Not uncommon. July—Sep- tember. The records from other countries include all the three British species of Hi/pochoer-is. Only uredospores were seen in British specimens. (Figs. 100, 101.) Fip;. 100. P. Hi/pochoeridis. Urt'dospore (British) on H. Fig. 101. P. Hypochoeridis. Teleuto- spores and uredospore, on H. glabra (Berlin, ex herb. Sydovv). This species, which has been often stated to be a Brachypuccinia, differs from most others of the type of P. Hieracii
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON COMPOSITE 149 On Hypochoeris radicata. Not uncommon. July—Sep- tember. The records from other countries include all the three British species of Hi/pochoer-is. Only uredospores were seen in British specimens. (Figs. 100, 101.) Fip;. 100. P. Hi/pochoeridis. Urt'dospore (British) on H. Fig. 101. P. Hypochoeridis. Teleuto- spores and uredospore, on H. glabra (Berlin, ex herb. Sydovv). This species, which has been often stated to be a Brachypuccinia, differs from most others of the type of P. Hieracii in having two kinds of uredo-sori—the primary ones 1—2 mm. wide, and only on the leaves, the secondary ones conspicuously smaller, almost punctiform. In this respect it approaches P. Cyani and P. obtegens, but Jacky showed that in cultures it did not produce si)erm(>gones (Centralbl. f. Bakter. 1907, xviii. 83), as they do. The alleged punctations of the teleutospores were invisible in all the specimens I have seen. Distribution Australia. Europe, Siberia, North America, Chili, 24. Puccinia Leontodontis Jacky. Puccinia Hieracii Plowr. Ured. p. 184 P. Leontodontis Jacky, p. 75. 114. Fischer, Ured. Schweiz, p. 231, f. 182. Svdow, Monogr. i. Uredospores. Sori amphigenous, but chiefly hypophyllous, scattered, not confluent, minute, punctiform, surrounded by the cleft epidermis, cinnamon; spores globose to ellipsoid, echinu- late, brown, 25—32 /u, diam. or 27—35 x 24—27 /x, always with two opposite germ-pores above the equator. Teleutospores. Sori similar, but darker-brown; spores variable, ellipsoid to oblong or obovate, rounded at both ends, not thickened above, not constricted, delicately verruculose or. 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
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