. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON UMBELLIFERiE 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. Chaerophylli. — Plowright's statement { p. 270) that this aecidium was found by him on Conopodium denudatmn 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. Di
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON UMBELLIFERiE 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. Chaerophylli. — Plowright's statement { p. 270) that this aecidium was found by him on Conopodium denudatmn 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 Grev. Flor. Edin. p. 430 (1824). Sydow, Monogr. i. 376. P. Bunii Winter ; Plowr. TJred. p. 206. P. Umhelliferarum DC. ; Oooke, 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 Fig. 135. p. tumida. Teleu- above, hardly constricted, smooth, tospore^, mesospore and ure- brownish, 26—36x14—26/i; pedicels hyaline, short, deciduous; an occasional raesospore is found. On Carum majus (= Conopodium denudatum = Bunium flescu- oswn). Not uncommon. April, May. (Fig. 135.) Formerly confounded with P. Bulbocastani, 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 aecidia. Plowright states that the mycelium is perennial, but this is doubtful. The sori appear to be confined to the radical leaves ; I
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