. The British rust fungi (Uredinales), their biology and classification. Uredineae. HYALOPSOKA 375 (mostly four) cells ; epispore thin, smooth, colourless; germ- pore not perceptible. On Polypodium Di^yopteris. Uredospores, June—August; teleutospores, May and June, on young leaves (Magnus). Rare. (Fig. 279.) Fischer, who records it also on P. Rohertianu^n, states that the teleuto- spores germinate in Jvnie. 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
. The British rust fungi (Uredinales), their biology and classification. Uredineae. HYALOPSOKA 375 (mostly four) cells ; epispore thin, smooth, colourless; germ- pore not perceptible. On Polypodium Di^yopteris. Uredospores, June—August; teleutospores, May and June, on young leaves (Magnus). Rare. (Fig. 279.) Fischer, who records it also on P. Rohertianu^n, states that the teleuto- spores germinate in Jvnie. 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 : Eprope, North America, 2. Hyalopsora Polypodii Magn. Uredo linearis var. rulj/podii Pers. Syn. p. 217. U. Filicum Desm.; Cooke, Handb. p. 526; Micr. Fung. p. White, Scot. Nat. 1877, iv. 27, pi. 2, f. 7. U. Polypndii DC. Flor. fr. vi. 81. Plovvr. Ured. p. 256 Fungus Flor. Yorkshire, p. 204. Sacc. Syll. vii. 857 PiLCciniastrum Polypodii Dietel, in Hedwig. 1899, xxxviii. 260. Hyalopsora Polypodii ^lagn. Ber. Deutsch. Bot. Gesell. 1901, xix. 582. Fischer, Ured. Schweiz, p. 474, f. 309. Arthur, N. Anier. Flor. vii. 112. Dietel, Annal. Mycol. 1911, i.\. 530. Uredinopsis 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 two kinds, (1) thick-walled (2—3 /i), with very faint warts, 26—38 X 18—29/x, Avith 6—8 scattered germ-pores, (2) thin-walled {I —H fi), covered unitormly with femt Uredospores, on Gysto. distant warts, 22—35 X 13—20/i, with pteris fragills (Shrews- four equatorial germ-pores. Teleutospores. In the epidermal cells, often tilling them completely, showing as yellowish-b
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