::ti; 



MILKS |\ A 



( )n Cystopteri* ffit<iUis ( = /• 'ol// podium fragile Linn.) and its 

 v.u. 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 thai the teleutospores 

 have been found in Britain, and the description is taken from Dietel ami 

 Fischer. Dietel has shown Ann. Mycol. I.e.) that infection by the 

 uredospores can be performed easily in a room on G. 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). 



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, 

 smooth below, 22—30 x 15—16/*; 

 wall moderately thick (1-| — 2 p). 

 [Teleutospores. Not found in 

 Britain.] 



Fig. 281. M. Dieteliana. Uredo- 

 spores, on P. vulgare var. serra- 

 tum (C. H. Wright). They were 

 enclosed in a thin white peridium. 



