144 STUDIES IN FOSSIL BOTANY 



identified, at least with great probability, with those 



Fig. 58. — Lepidodendron brevifolium. Transverse section of stem. p, pith, almost 

 wholly destroyed ; x, broad zone of primary wood ; px, protoxylem at periphery of 

 primary wood ; x~, secondary wood ; ph, phloem ; br, small stele becoming detached 

 to supply a branch ; fid, periderm ; l.b, leaf-bases, showing bundle and parichnos. All 

 the more internal cortex, which once intervened between stele and periderm, has 

 perished, a 4J. S. Coll. 54. (G. T. G.) 



preserved as impressions or casts, in which the external 

 characters are visible. 1 



1 See Carruthers, "Structure of the Stems of the Arborescent Lyco- 

 podiaceae of the Coal-measures," Monthly Microscopical Journal, vol. 

 ii. 1869. As, however, the identification is not absolutely certain, some 

 authors prefer to use Binney's name, L. vasculare, rather than L. 

 selaginoides. 



