286 



DESCRIPTIVE CATALOGUE 



a few being in pairs. Vessels are uniformly distributed, rather 

 larger toward the inner zones of the growth-rings. The regular 

 texture of the wood and small size of the vessels can be seen in 

 text-figs. 89, 90. Text-fig. 89 should be compared with text- 

 fig. 80, which is on exactly the same scale of magnification, to 

 show the more usual relation between vessels and fibres. The 



wood-fibres ffibre-tracheids) are 



arranged 



with remarkable 



Text-fig. 88. Apt inn a radiuta, Stopes. Transverse section of outer part of 

 the stem, showing the wood with the multiseriate rays extending into 

 the phloem, where they end in funnel-shaped expansions, a. After 

 Stopes. 



regularity in radial rows (text-figs. 89, 90), and are principally 

 squarish or rectangular in shape. 



Wood-parenchyma is almost, if not entirely, absent the 

 nature of the petrifaction makes it impossible to determine this 

 point absolutely. Some elements lying adjacent to the vessels 



