﻿FOLIAGE. 



83 



Fig. 45. — Cycadeoidea ingens (type). Transverse sections of entire pinnules, showing the structure of the pinnule bundles 

 as drawn diagiammatically on microphotographs, enlarged about 140 times. The upper figure is from thin section 46, 

 cutting through the tips of the pinnules of a very young erectly prefoliate frond. The lower figure is from thin section 

 170 (cf. photograph 6, Plate XXXI), cutting through the base of a pinnule of a larger young and partly emergent 

 frond. In both sections only occasional cells are clearly conserved in the heavy sclerenchyma region occupying all 

 the space beneath the bundles. 



