376 MILESINA ; 
On Cystopteris fragilis (=Polypodium 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 uredospores 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. ic.) 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 zo 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 Polypodit B, White, Scot. Nat. 1877, iv. 162, pl. 2, f. 5. Sace. 
Syll. vii. 768, 
Melampsorelia Dieteliana Sydow, in Mycoth. Germ. no. 62 (1908). 
Milesina Dieteliana Magn. Ber. Deutsch. Bot. Gesell. xxvii. 325 (1909). 
Uredospores. 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, 
Fig. 281. M. Dieteliana. Uredo- smooth below, 22—30 x 15—16 4; 
spores, on P. vulgare var. serra- wall moderately thick (14—2 p). 
tum (C. H. Wright). They were Tel i 
enclosed in a thin white peridium. [Leleutospores. Not found in 
Britain. ] 
