UREDINOPSIS 



379 



UREDINOPSIS M; 



iio-nus. 



Teleutospores solitary, extracellular, hyaline, septate. Uredo- 

 sori subepidermal, with a distinct peridium ; ureclospores hyaline, 

 pedicellate, without germ-pores. On Ferns. 



This genus is distinguished from all others by the fact that 

 the teleutospores are dispersed without order among the cells 

 of the mesophyll. There are three known forms of spores, 

 which seem to occur simultaneously, and not in a fixed order of 

 succession as in most pleomorphic Uredinales. It is one of the 

 lowest genera from the point of view of organisation ; and its 

 cytological investigation would doubtless yield a rich harvest of 

 new ideas. 



Not yet discovered in Britain. 



Uredinopsis filicina Magn. 



Protomyces Ifilicinus Niessl, in Rab. Fung. Europ. no. 1659, 1873. 

 Uredo Polypodii var. Phegopteris Winter, Pilze, p. 253. Sacc. Syll. 



vii. 858. 

 Uredinopsis filicina Magn. Atti Congress. Bot. Internaz. 1892, p. 167. 



Fischer, Ured. Schweiz, p. 476, f. 310, 311. 



Uredospores. Sori hypophyllous, small, roundish, thickly 

 scattered, yellowish-brown, of two kinds — (1) smaller, about 



Fig. 284. U. filicina. On P. Phegopteris. a, urt'(l<>s]>ores = ?R>cidiospores ; 

 b, uredospores (no. 2) and parajmysis ; c, teleutospores. From a German 

 specimen, issued by Sydow. 



£ mm. diam., fiattish, semi-transparent, always situated beneath 

 a stoma, surrounded by a rather tough peridium, rupturing 

 above ; spores more or less obovate-polygonal, on slender 



