. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 3X QYMNOSPOEANGIUM JEcidiospores. zEcidia hypophyllous, in irregular or circular groups, horn-shaped, conical, curved, .1 nun. wide, 2 nun. long, at length open and fimbriate above, yellowish- brown, on round spots which are brownish below, and bright-orange or 'xli red on the upper side; spores finely verruculose, brown, 21—28x19—24/^; Pig. 233. G. Juniperi. germ-pores 8—10, scattered. Groups of reculia on leaflet ° J of Mountain Ash xih; Teleutospores. Spore-masses on "•:m anopened perid
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 3X QYMNOSPOEANGIUM JEcidiospores. zEcidia hypophyllous, in irregular or circular groups, horn-shaped, conical, curved, .1 nun. wide, 2 nun. long, at length open and fimbriate above, yellowish- brown, on round spots which are brownish below, and bright-orange or 'xli red on the upper side; spores finely verruculose, brown, 21—28x19—24/^; Pig. 233. G. Juniperi. germ-pores 8—10, scattered. Groups of reculia on leaflet ° J of Mountain Ash xih; Teleutospores. Spore-masses on "•:m anopened peridium young twigs and occasionally on leaves, more or less globose, 1—3 mm. across, at first chocolate-brown, then orange, soft, gelatinous; spores obtusely fusiform, of two kinds, first thick-walled and brown, second thin-walled and yellowish, 31—52x21—30/z, (Dietel), 66—75 x 17—27/x (Plowright); germ-pores one or two in each cell; pedicels rather long. .Ecidia on Pyrus Aucuparia, July—October; teleutospores on Juniperus communis. May and June. Not common: Surrey, etc. iEcidia very abundant at Blair Athol, August, 1905 (D. Prain). (Fig. 233.) The teleutospores differ from those of the other European species in the possession of a broad colourless papilla over each germ-pore. Their mycelium causes fusiform swellings of the smaller branches. Brcbner infected a leaf of Mountain Ash from the teleutospores and obtained spermogones in eleven days. Distribution : Europe, North America. 4. Gymnosporangium Sabinae Wint. Tremella Sabinae Dicks. PI. Crypt. Brit. i. 14. Podisoma Sabinae Fr. : < 'ooke, Handb. p. 510 ; Micr. Fung. p. 214. Roeslelia cancellata Reb. Fl. Neom. p. 350. Cooke, Handb. p. 533 ; Micr. Fung. p. 193, pi. 2, f. 20, 21. Gymnospora n <ji a in Sabi/iae Wint. Pilze, p. 232. Plowr. Ured. p. 230, pi. 4, f. 11, 12. Fischer, Ured. Schweiz, p. 394, f. 279. Sacc. Syll. vii. 739. Sydow, Monogr. iii. 51, f. 2&. Spermogones. Epiphyllous, on large yello
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