XV] 



STIGMARIA 



157 



well preserved to justify its reference to L. fnUginosum. The 

 irregularly crenulated edge of the primary xylem, x (fig. 175), is 

 succeeded by a broad band of parenchyma (the meristematic 

 zone), TO, and beyond this are remnants of the secretory zone, s. 

 The structure of the leaf-traces corresponds with that of other 

 specimens of the type, but the much steeper course of these 

 vascular strands, It, It' (fig. 176), is a feature in which this 

 example differs from most of those referred to L. fuliginosum. 

 Such evidence as is available would seem to poini to the 



Fio. 177. Stiymaria radiculosa (Hick). (Prom sections in the Manchester 

 University Collection.) 



absence of trustworthy criteria enabling us to separate, on 

 anatomical grounds, Lepidophloios and Lepidodendron^. 



Stigmaria radiculosa (Hick). 



We have no proof of the nature of the subterranean organs of 

 Lepidodendron fvliginosum, though it is not improbable that the 

 specimens described below may be correctly assigned by Weiss 

 to that species. Prof. Weiss ^ has made an interesting contribu- 

 tion to our knowledge of a type first described by Hick^ under 

 the name Tylophora radiculosa, a designation which he after- 



1 Seward (06) p. 378. ^ Weiss, F. E. (02). •' Hick (93). 



