206 



CLADOXYLEAE 



CH. 



as convincing. The type-specimen consists of a small piece of 

 stem about 3 cm. in breadth showing three complete oval steles 

 and portions of two others which seem to be in their original 

 position and probably formed part of a series of peripheral steles 



FIG. 460. A, C. A single stele and tracheids of Cladoxylon Kidstoni. (Kidston 



Coll. 630 B, 630 C.) 



B. Cladoxylon mirabile, part of a stele. (Museum of Practical 

 Geology, 15872.) 



such as those shown in fig. 459, D. Each stele consists mainly 

 of secondary xylem (fig. 460, A) with some crushed tissue, pre- 

 sumably phloem, on its outer face. The secondary xylem is 



