354 



FILICALES 



[CH. 



ment of vascular tissue identical with that in the petioles and 

 rhizomes of some protostelic Gleichenias. The stele of one of 

 the Belgian rhizomes appears to be identical with that of 

 Gleichenia dicarpa (fig. 237, C. p. 310). 



.>5^.^tS5^ 



Fig. 262. A. Gleichenites longipennis Heer. 



B. G. delicatula Heer. 



C. G. Nordenskioldi Heer. 



D. G. Zippei. (Corda.) 

 (After Heer ; A, B, D, very slightly reduced.) 



Gleichenites Zippei (Corda). Fig. 262, D. 



This species, originally described by Corda as Pecopteris 



Zippei'^ and afterwards figured by Heer" as Oleichenia Zippei 



1 Corda, iu Eeuss (46) p. 95, PL xlix. - Heer (75), p. 44, Pis. iv.— vii. 



