206 



CLADOXYLBAE 



[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 Gladoxylon Kidstoni. (Kidston 

 CoU. 630 B, 630 C.) 

 B. Gladoxylon 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 



