. The British rust fungi (Uredinales), their biology and classification. Uredineae. PUCCINIASTRUM 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18—21 x 14 fjb; 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 Britai
. The British rust fungi (Uredinales), their biology and classification. Uredineae. PUCCINIASTRUM 365 Fig. 272. P. Agrimoniae. Uredospores. spores shortly ellipsoid or obovate, echinulate, orange, 18—21 x 14 fjb; 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 Tranzscliel and Dietcl ; see Engler u. Prantl, Natiirl. Pflanzenfam. vol. i. pt. 1** p. 24. Until 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. Distribution : Europe, North and South America. Asia, Pucciniastrum CircaeaB Speg. Uredo Circaeae Schum. PL Sail. ii. 228. Cooke, Micr. Fung. p. 217, pi. 7, f. 135, 136. Puccinia Circaeae Pers.; Cooke, Handb. p. 507 Melampsora Circaeae Winter ; Plowr. Ured. p. 245. Pucciniastrum Circaeae Speg. 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 peridium X 180; (7, 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/u,; 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 have been
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