. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. PUCCINIASTRl'M 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18â21 x 14- /x; epispore rather thick, with indistinct germ-pores. [Teleutospores. Sori similar, but indefinite, clear-brown: spores subepidermal, extracellular, emirate, smooth, each divided into four cells by two longitudinal walls at right angles to one .-mother, 30 x 21â30 //,.] On Agrimonia Eupatoria. Uredospores common, Julyâ September; teleutospores, very rare everywhere, not
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. PUCCINIASTRl'M 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18â21 x 14- /x; epispore rather thick, with indistinct germ-pores. [Teleutospores. Sori similar, but indefinite, clear-brown: spores subepidermal, extracellular, emirate, smooth, each divided into four cells by two longitudinal walls at right angles to one .-mother, 30 x 21â30 //,.] On Agrimonia Eupatoria. Uredospores common, Julyâ September; teleutospores, very rare everywhere, not yet found in Britain. (Fig. 272.) We owe our knowledge of the teleutospores to Tranzschel and Dietel ; see Engler u. Prantl, Nattirl. Pflanzenfam. vol. i. pt. 1**, p. 24. Until they were discovered, the position of the fungus was cpiite uncertain. Klebahn (see Zeitschr. f. Pflanzenkr. 1907, xvii. 149) proved that the parasite could maintain itself by over-wintered uredospores. Distribution : Europe, Asia, North and South America. 2. Pucciniastrum Circaeae Speg. Uredo Circaeae Schum. PI. Sail. ii. 228. Cooke, Micr. Fung. p. 217, pi. 7, f. 135, 136. /''//<:<_â /'// ia Circaeae Vers.; Cooke, Handb. p. 507 M/lampsora Circaeae Winter ; Plowr. Ured. p. 245. Pucciniastrum Circaeae 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); b, uredospore x600; c, part of peridiuin 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, 21â24x12â14^; 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 s
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