﻿8 WEISS and Lomax, Lepidodendron selaginoides. 



EXPLANATION OF PLATE. 



Fig. i. A tangential section of stem represented in fig. 2, 

 showing the unthickened Lepidodendron axis on its 

 way out to the oval, depression (note that the axis 

 stands in a somewhat lower position than it occupies 

 at the surface, see fig. 2). 



,, 2. A photograph by Mr. Lomax of the exterior of a decorti- 

 cated (ribbed) stem {Sigillaria vascularis of Binney), 

 showing oval depression from which the lepidoden- 

 droid branch was given off. 



„ 3. Enlarged view of section of stem of Lepidode?idron 

 selaginoides, showing primary and secondary wood. 



,,4. A transverse section of a main axis and lateral branch 

 organically connected, the former showing a con- 

 siderable amount of secondary wood (W 2 ) typical of 

 Sigillaria vascularis (Binney), while the latter is a 

 typical section of Lepidodendron selaginoides. 



