. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON EPILOBIUM 199 Pucoinia pulverulenta Grev. Fl. Bdia. p. 432 (1824). Cooke, .Handb. p. 507 ; Micr. Fung. p. 211, pi. 4, f. 78—9. P]owr. Ured. p. 151. P. EpUohii DC. ; Sacc. Syll. vii. 608 P. EpiloUi-tetragoni Wint. Pilze, p. 214 (1884). Sydow, Monogr. i. 424. Fischer, Ured. Schweiz, p. 152, f. 118. McAlpine, Rusts of Australia, p. 170, f. 79—81. Spermogones. Scattered among the aecidia, honey-coloured. JEcidiospores. -^cidia hypophyllous or, when very abundant, also epiphyllous, scattered rather closely o
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON EPILOBIUM 199 Pucoinia pulverulenta Grev. Fl. Bdia. p. 432 (1824). Cooke, .Handb. p. 507 ; Micr. Fung. p. 211, pi. 4, f. 78—9. P]owr. Ured. p. 151. P. EpUohii DC. ; Sacc. Syll. vii. 608 P. EpiloUi-tetragoni Wint. Pilze, p. 214 (1884). Sydow, Monogr. i. 424. Fischer, Ured. Schweiz, p. 152, f. 118. McAlpine, Rusts of Australia, p. 170, f. 79—81. Spermogones. Scattered among the aecidia, honey-coloured. JEcidiospores. -^cidia hypophyllous or, when very abundant, also epiphyllous, scattered rather closely over nearly the whole surface of the leaf, cup-shaped, with a white torn re volute margin; spores very delicately verruculose, orange, 16—26 jm. Uredospores. Sori hypophyllous, scattered or circinate, sometimes confluent, pulverulent, chestnut-brown; spores globose to ovoid, remotely echinulate, brown, 20—28 X 15—25 fi, with two germ- pores. Teleutospores. Sori hypophyl- lous, often circinate, soon naked, „ ^ Fig. 147. P. pulverulenta. Te- pulverulent, dark-brown; spores leutoepores and uredospore. ellipsoid or ovoid, rounded at both ends, somewhat thickened above (up to 5 fi) with a broad low cap-like addition, gently constricted, smooth, brownish, 24—35 X 14—20 fl; pedicels hyaline, slender, deciduous. On Epilohium hirsutum, E. montanum, E. tetragonum. iEcidia, May and June; teleutospores, June—November. Common. (Fig. 147.) The aecidium-formiug mycelium appears (but perhaps falsely) to be perennial, for the same plants are attacked year after year. The aecidia appear in May and cover leaf after leaf, as they are developed. The affected plants are easily recognisable by their much paler and yellowish colour. Soon the sori of uredo- and teleutospores begin to appear, at first on the same leaves, but afterwards on the later-formed leaves higher up the plant. In September and October the small last-formed leaves are thickly covered by the teleutospores ; it is pr
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