. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON POLYGONACEvE 223 scattered singly : those of the Puooinia are in largish orbicular clusters and are rarely found singly; if not clustered, they spread over the whole leaf. In Plowright's herbarium are some leaves of Lychnis diurna, covered with uredo-sori, which he mistakenly assigned to P. Lychnidearum : there are no teleutospores of the latter, however, but a very few of P. Behenis were found in the same sori. See under P. Lychnidearwn. The circinate arrangement of the sori, on paler spots, is very similar
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON POLYGONACEvE 223 scattered singly : those of the Puooinia are in largish orbicular clusters and are rarely found singly; if not clustered, they spread over the whole leaf. In Plowright's herbarium are some leaves of Lychnis diurna, covered with uredo-sori, which he mistakenly assigned to P. Lychnidearum : there are no teleutospores of the latter, however, but a very few of P. Behenis were found in the same sori. See under P. Lychnidearwn. The circinate arrangement of the sori, on paler spots, is very similar in both species. Distribution : Central and Western Europe. 93. Puccinia Acetosse Korn. Uredo Acetosae Schum. Plant. Sail. ii. 231. Puccinia Acetosae Korn. in Hedwig. 1876, p. 184. Plowr. in Trans. Brit. Myo. Soc. i. 57. Sacc. Syll. vii. 638. Sydow, Monogr. i. 581. Fischer, Ured. Schweiz, p. 134, f. 101. Uredospores. Sori amphigenous, scattered, minute, roundish on the leaves, elongated on the petioles and stems, soon naked, ferruginous-brown; spores globose to obovate, sparsely aculeate, brownish, 24—30 x 20—23 /j., with two (rarely three) germ-pores. Teleutospores. Son similar, but Teleiitospores and uredospore. dark-brown; spores ellipsoid, ob- long, or subclavate, rounded at both ends or slightly attenuated below, not thickened at the apex, but furnished with a broad pore-cap, slightly constricted, delicately verruculose, chestnut- brown, 28—42 X 19—24 fi; pedicels hyaline, slender, deciduous, as much as 35 /a long. On Rumeoo Acetosa. Maiden, Yorkshire, July 16, 1894 (A. W. Saunders). Ireland, co. Antrim (J. Adams), August, 1909. Bewdley, Worcestershire, August, 1907, etc. (Fig. 171.) There is no doubt that this species is often mistaken for Uromyoes Acetosae. In the absence of the two-celled teleutospores, which are rare, it could be distinguished mainly by its smaller sori, and more spiny uredospores (the spines are quite colourless). The teleutospores show the d
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