272 



CORDAITEAE 



[CH, 



ct. 



FIG. 483. Mesoxylon Sutcliffii. Transverse sections of stem. A. a, outer pith ; 

 6, axillary bud; x z secondary xylem. B. cp, cf, centripetal and centrifugal 

 xylem ; px, protoxylem. C. It, leaf -traces in the cortex ; s, stele of axillary 

 branch; ph 2 , secondary phloem. D. Leaf -trace bundles, It, external to the 

 phloem, ph 2 . (A, C, D, sections in the Manchester Collection, 717 6; B, Cam- 

 bridge Botany School, 530.) 



