. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^ 187 to have been shown experimentally that the secidia and the teleutospores described above are genetically connected. The markings on the teleuto- spore are really little, round, densely crowded pits, not actual reticulations as in P. ChaerophyUi. — Plowright's statement { p. 270) that this secidium was found by him on Conopodium denudatum is a mere slip of the memory, as I am informed by Mr W. G. Smith, in whose company it was found at Leagrave, near Dunstable, on the date mentioned. Distr
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^ 187 to have been shown experimentally that the secidia and the teleutospores described above are genetically connected. The markings on the teleuto- spore are really little, round, densely crowded pits, not actual reticulations as in P. ChaerophyUi. — Plowright's statement { p. 270) that this secidium was found by him on Conopodium denudatum is a mere slip of the memory, as I am informed by Mr W. G. Smith, in whose company it was found at Leagrave, near Dunstable, on the date mentioned. Distribution : Western and Central Europe, Algeria. 59. Puccinia tumida Grev. Puccinia tumida Urev. Flor. Edin. p. 430 (1824). Sydow, Monogr. i. 376. P. Bunii Winter ; Plowr. Ured. p. 206. P. Umhelliferarum DC. ; Cooke, Micr. Fung. p. 208 , pi. 4, f. 71—2. Uredospores. Very few, oval, pale yellow, sparsely verrucu- lose, 20—25 x 15—18, mingled with the teleutospores. Teleutospores. Sori on the leaves, more often on the petioles and nerves, minute, but many crowded together and confluent in thickened elongated masses (up to 1 cm. long), covered by the ash-coloured epider- mis, for a considerable time, black- brown ; spores ellipsoid to ovate, rounded at both ends, not thickened Fi^. 135. P. tumida. Teleu- above, hardly constricted, smooth, ^jpoi^, mesospore and ure- brownish, 26—36x14—26/a; pedicels hyaline, short, deciduous; an occasional mesospore is found. On Car am majus (= Conopodium denudatum = Bunium flexu- osum). Not uncommon. April, May. (Fig. 135.) Formerly confounded with P. Bidbocastani, from which it is distin- guished by its very different habit. In that species the teleuto-sori are usually isolated on the leaves, and cause no swelling of the affected part as P. tumida always does : the latter moreover is without secidia. Plowright states that the mycelium is perennial, but this is doubtful. The sori appear to be confined to the radical leaves ; I have n
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