. The British rust fungi (Uredinales), their biology and classification. Uredineae. 376 MILESINA On Cystopteris fragilis {= Poly podium fragile Linn.) and its var. dentata. June—September. Rather rare (2700 ft. on Ben Lawers); occurring freely on cultivated Cystopteris in fern-cases. (Fig. 280.) The same remarks may be made about the iiredospores of this as of the previous species. In both cases it is not certain that the teleutospores have been found in Britain, and the description is taken from Dietel and Fischer. Dietel has shown (Ann. Mycol. ) that infection by the uredospores can be p
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 376 MILESINA On Cystopteris fragilis {= Poly podium fragile Linn.) and its var. dentata. June—September. Rather rare (2700 ft. on Ben Lawers); occurring freely on cultivated Cystopteris in fern-cases. (Fig. 280.) The same remarks may be made about the iiredospores of this as of the previous species. In both cases it is not certain that the teleutospores have been found in Britain, and the description is taken from Dietel and Fischer. Dietel has shown (Ann. Mycol. ) that infection by the uredospores can be performed easily in a room on C. fragilis; time of incubation fourteen days. This would, therefore, be a very convenient species for cytological investigation among the lowest types, but Dietel obtained no teleutospores. Distribution : Europe, North America. MILESINA Magnus. Teleutospores intracellular, hyaline, septate. Uredo-sori furnished with a peridium which opens at the summit with a pore; uredospores hyaline, pedicellate, with a thin epispore, but without germ-pores. On Ferns. 1. Milesina Dieteliana Magn. Milesia Polypodii B. White, Scot. Nat. 1877, iv. 162, pi. 2, f. 5. Sacc. Syll. vii. 768. Melampsorella Dieteliana Sydow, in Mycoth. Germ. no. 62 (1903). Milesina Dieteliana Magn. Ber. Deutsch. Bot. Gesell. xxvii. 325 (1909). Fig. 281. M. Dietelinna. Uredo- spores, on P. vuhiiire var. gerra- tum (C. H. Wright). They were pnclosed iu a thin white peridium. Sori hypophyllous, small, round, pustular, clustered loosely in small groups on brown irregular spots, pale- brown ; spores colourless, oblong or obovate, strongly but sparsely and irregularly echinulate above, smooth below, 22—30 x 15—16/^; wall moderately thick (1|—2 /j,). [TeleutosjJores. Not found in Britain.]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
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