. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON CYPERACEyE 247 downwards, smooth, brown, darker at the apex, 45—80 x 18— 22 yu-; pedicels brownish-yellow, persistent, 25—40 /u, long. iEcidia on Senecio Jacobaea, May and June; uredo- and teleutospores on Garex arenaria, July—May. Rare; Norfolk, Lincolnshire, Aberdeen, Burntisland. (Fig. 190.) The life-history of this parasite was investigated by Plowright, who at the same time demonstrated by his experimental cultures its distinctness from Puccinia Cartels and P. arenariicola. Fischer reco
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON CYPERACEyE 247 downwards, smooth, brown, darker at the apex, 45—80 x 18— 22 yu-; pedicels brownish-yellow, persistent, 25—40 /u, long. iEcidia on Senecio Jacobaea, May and June; uredo- and teleutospores on Garex arenaria, July—May. Rare; Norfolk, Lincolnshire, Aberdeen, Burntisland. (Fig. 190.) The life-history of this parasite was investigated by Plowright, who at the same time demonstrated by his experimental cultures its distinctness from Puccinia Cartels and P. arenariicola. Fischer records () an fecidium on Senecio Jacobaea, S. aquaticus and S. erucifolius closely resembling this, but points out at the same time that C. arenaria does not grow in Switzerland ; if, therefore, it is the same fungus, as it seems without doubt to be, its alternate stage must occur there on some allied species of Carex, such as C. disticha. Distribution : Germany, Holland, Switzerland (?), Russia. 113. Puccinia arenariicola Plowr. Puccinia arenariicola Plowr. Journ. Linn. Soc. Bot. xxiv. 90 ; Ured. p. 170. Sacc. Syll. ix. 311. Sydow, Monogr. i. 661. • JEcidiospores. zEcidia generally hypophyllous, in round clusters on circular yellow spots which are as much as 1 cm. diam. and margined with purple, cup-shaped, yellowish, with torn revolute margin; spores nearly smooth, yellow, 15—20 /t. Uredospores. Sori on yellowish spots, linear or oblong, surrounded by the torn epidermis, brown; spores globose to ovate, delicately echinulate, pale-brown, 18—22/i. Teleutospores. Sori generally hypo- phyllous, scattered or sometimes aggre- gated, oblong, as much as 1 mm. long, pulvinate, black; spores clavate or ob- long-clavate, rounded above where they are darker and much thickened (14//.), gently constricted, tapering downwards, smooth, brown, 40—65 x 14—-22 //,; pedicels brownish, persis tent, as much as 40 //, Fig. 191. P. arenariicola. iEcidia on leaf of Cen- taur
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