. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON UMBELLIFER/E 195 67. Puccinia Chaerophylli Purt. Puccinia Chaerophylli Purton, Midi. Flor. iii. 303. i. 367. Fischer, Ured. Schweiz, p. 129, f. 98. P. Pimpinellae Str. ; Plowr. Ured. p. 155 Sydow, Monogr. Spermogones. Pale-yellow, roundish. JZcidiospores. /Ecidia on the leaves and petioles, on the leaves scattered or circinate, on the petioles and nerves in dense elongated clusters and causing a slight hypertrophy, between cup-shaped and pustulate, yellowish; peridium poorly developed ;
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON UMBELLIFER/E 195 67. Puccinia Chaerophylli Purt. Puccinia Chaerophylli Purton, Midi. Flor. iii. 303. i. 367. Fischer, Ured. Schweiz, p. 129, f. 98. P. Pimpinellae Str. ; Plowr. Ured. p. 155 Sydow, Monogr. Spermogones. Pale-yellow, roundish. JZcidiospores. /Ecidia on the leaves and petioles, on the leaves scattered or circinate, on the petioles and nerves in dense elongated clusters and causing a slight hypertrophy, between cup-shaped and pustulate, yellowish; peridium poorly developed ; spores verruculose, orange, 18—35 x 16—26 p. Uredospores. Sori hypophyllous, scattered, minute, roundish, pulverulent, cinnamon; spores globose to obovate, echinulate, pale brownish-yellow, 20—30 x 18—25 p; with three usually equatorial germ-pores. Teleutospores. Sori similar, but black-brown, on the petioles more elongated ; spores ovate to oblong, rounded at both ends or gently at- tenuated below, not thickened above, slightly constricted, reticulated, yellow- ish-brown or brown, 24—36 x 16—25 p\ pedicels hyaline, thin, as long as the spore or shorter. On leaves, petioles, and stems of Anthriscus silvestris, Chaerophyllum temulwm, Myrrhis odorata. Not com- mon. ^Ecidia, May and June ; teleuto- spores, July—October. (Fig. 143.). Fig. 143. P Chaerophylli. Teleutospores, a, on Anthriscus, b, on Myr- rhis. It was proved experimentally by Klebahn that this parasite is not identical with P. Pimpinellae, and by Semadeni that it is not identical with that or with P. Heraclei. The latter also reared spermogones and secidia from the basidiospores, and uredo- and teleutospores from the Becidiospores, of P. Chaerophylli; thus proving that all the spore-forms described above belong to the same species. The feeble development of the peridium and the pustule-like, not cup-shaped, aecidia are paralleled by those of P. Heraclei. The markings on the teleutospore are formed by a
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