. The British rust fungi (Uredinales) their biology and classification. Rust fungi. HYALOPSORA 375 (mostly four) cells; epispore thin, smooth, colourless; germ- pore not perceptible. On Polypodium Dryopteris. Uredospores, JuneâAugust; teleutospores. May and June, on young leaves (Magnus). Rare. (Fig. 279.) Fischer, who records it also on P. Robertianum, states that the teleuto- spores germinate in June. , Arthur prefers to call the first kind of uredospore the aecidiospore; this is possibly correct but, until something is known about their development, it is premature to decide. According to h
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. HYALOPSORA 375 (mostly four) cells; epispore thin, smooth, colourless; germ- pore not perceptible. On Polypodium Dryopteris. Uredospores, JuneâAugust; teleutospores. May and June, on young leaves (Magnus). Rare. (Fig. 279.) Fischer, who records it also on P. Robertianum, states that the teleuto- spores germinate in June. , Arthur prefers to call the first kind of uredospore the aecidiospore; this is possibly correct but, until something is known about their development, it is premature to decide. According to him, the secidia have no peridium, and the uredo-sori a very rudimentary one, but I have repeatedly found both kinds of spores in the same sorus. They appear perfectly smooth, when seen in water. Distribution : Europe, North America. 2. Hyalopsora Polypodii Magn. Uredo linearis var. Polypodii Pers. Syn. p. 217. U. Filicum, Desm.; Cooke, Handh. p. 526; Micr. Fung. p. 215 White, Scot. Nat. 1877, iv. 27, pi. 2, f. 7. U. I'olypodii DC. Flor. fr. vi. 81. Plowr. Ured. p. 256 Fungus Flor. Yorkshire, p. 204. Sacc. Syll. vii. 857 Pucdniastrum Polypodii Dietel, in Hedwig. 1899, xxxviii. 260. Hyalopsora Polypodii Magn. Ber. Deutsch. Bot. Gesell. 1901, xix. 582. Fischer, Ured. Schweiz, p. 474, f. 309. Arthur, N. Amer. Flor. vii. 112. Dietel, Annal. Mycol. 1911, ix. 530. Vredinopsis Polypodii Liro, Uredin. Fennic. 1908, p. 496. Uredospores. Sori hypophyllous, minute, scattered, bullate, golden-yellow, without a peridium, rup- turing irregularly; spores more or less globose or ellipsoid, of tv?o kinds, CI) thick-walled (2â3 /a), with very faint warts, 26â38 X 18â29/i, with 6â8 scattered germ-pores, (2) thin-walled /I -, 1 \ 1 T 1 -xi, r â 4. Kg- 280. H. Polypodii. (1â1^ fi), covered uniformly with taint uredospores, on Cysto. distant warts, 22â35 x 13â20/i, with y^«^"« /ra^ais (Shrews- four equatorial germ-pores. Teleutospores. In the epidermal cells, often
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