ULODENDRON AND HALONIA 



169 



branch is not quite an inch thick, and contains a 

 stele about 3.5 mm. in diameter. The wood is per- 

 fectly solid, consisting entirely of tracheae, without 



Fig. 68. — Lcpidophloios scoticus, Kidston. A. Bifurcating Halonial branch, showing 

 numerous tubercles, and the characteristic leaf-bases. About \ nat. size. B. Leaf, 

 cushions enlarged, showing the scar with the usual three prints. From the 

 Calciferous Sandstone series. After Kidston. 



any indication of a medulla. This is not, however, 

 a peculiarity of the Halonial form of branch, for in 

 this species, L. Wunsckianum, the ordinary vegetative 



