DESCRIPTIVE CATALOGUE 



marked, and have well-defined narrow zones of autumn wood. 

 The number of elements composing each growth-ring varies from 

 about 20 to 70 elements in radial series, the thicker rings measur- 

 ing about 2 mm. in width. The number of narrow elements of 

 autumn wood is about 3 to 8. In the outer rings of wood a few 

 of the autumn zones are locally doubled, reminding one of the 



Text-fig. ffl.Podocarpoxylon Solmti, sp. noir. Longitudinal section of the 

 pith, showing the ordinary cells, p., among which are irregular chains 

 of specialised cells. I., large empty cells, alternating with, s., thickened 

 stone-cells; px., the protoxylems. ]S'o. V. 2117 d. 



" composite " rings so noticeably developed in the contempora- 

 neous Cupres8inoA*ylon vectense (see p. 169). The luood is uniform, 

 and in the inner zones the individual tracheids are somewhat 



