OF LOWER GREEVSAND PLANTS. 



321 



loosely dispersed through the ground-tissue (PI. XXXI, fig. l,.r, 

 and text-fig. 103, ,r). These are very similar to the wood 

 abutting oil the pith in Benndtites, but the zone of these 

 elements is wider and more pronounced in the present fossil. 

 In longitudinal section their rather wandering and anastomosing 

 course can be seen (text-fig. 109, B, pm.}. The tracheids are 



-* ' 

 II \ 



t *:* 





r * ' I 



*\* [TV 



* : I % > ' ^ ^ ? m * - " 



llfilfftil 



r ' *; v 



^ 



'A^;:; 



Vf'- 



z , * 



Text-fig. 105. Colymbetes Edwardsi, sp. nor. Transverse section 01 small 

 part of the wood enlarged, showing the rather irregular radial series 

 of secondary tracbeids. No. V. 6127 a. 



very small, averaging only 18-20 /u in diameter, with very 

 thick walls. They appear to have oval-scylariform or circular 

 pits. 



Even the larger series of tracheid-rows of this zone do not 



y 



