. The British rust fungi (Uredinales) their biology and classification. Rust fungi. PUCCINIASTRUM 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18—21 x 14 ya; epispore rather thick, with indistinct germ-pores. [Teleutospores. Sori similar, but indefinite, clear-brown; spores subepidermal, extracellular, cuneate, smooth, each divided into four cells by two longitudinal walls at right angles to one another, 30 x 21—30/*.] On Agrimonia Eupatoria. Uredospores common, July— September; teleutospores, very rare everywhere, not yet found in Britain.
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. PUCCINIASTRUM 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18—21 x 14 ya; epispore rather thick, with indistinct germ-pores. [Teleutospores. Sori similar, but indefinite, clear-brown; spores subepidermal, extracellular, cuneate, smooth, each divided into four cells by two longitudinal walls at right angles to one another, 30 x 21—30/*.] On Agrimonia Eupatoria. Uredospores common, July— September; teleutospores, very rare everywhere, not yet found in Britain. (Fig. 272.) We owe our knowledge of the teleutospores to Tranzsohel and Dietel ; see Engler u. Prantl, Natiivl. Pflanzenfam. vol. i. pt. 1**, p. 24. they were discovered, the position of the fungus was quite uncertain. Klebahn (see Zeitschr. f. Pflanzenkr. 1907, xvii. 149) proved that the parasite could maintain itself by over-wintered uredospores. Until Distribution : North and South Europe, America. Asia, 2. Pucciniastrum Circaeae Speg. Uredo Gircaeae Sohum. PI. Sail. ii. 228. Cooke, Micr. Fung. p. 217, pi. 7, f. 135, 136. Puccinia Gircaeae Pers.; Cooke, Handb. p. 507 Melampsora Gircaeae "Winter ; Plowr. Ured. p. 245. Pucciniastrum Gircaeae Speg. Dec. Myc. 65. Sacc. Syll. vii. 763. Fischer, Ured. Schweiz, p. 461, f. Fig. 273. P. Circaeae. a, half of a leaf of C. lutetiana, showing uredo-sori (slightly enlarged); 6, uredospore X 600; c, part of peridium X 180; d, teleutospores, be- neath the epidermis, x 300. Uredospores. Sori hypophyllous, on paler patches bounded by veins, minute, yellowish, crowded, slightly confluent, surrounded by the epidermis and by a peridium which opens at the summit with a pore; spores ovate, 21—24x12—14/i; epispore thin, covered with minute distant warts, without evident germ-pores; paraphyses wanting; peridium usually opening beneath a Please note that these images are extracted from scanned page images that may h
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