114 



CONTFERALES (RECENT) 



[CH. 



maturity, the bract-scale usually extending beyond the edge oJ 

 the seminiferous scale (fig. 705), in Abies bracteata reaching 

 length of 5 cm. In Sequoia (fig. 702 B) the cone-scales show no 

 outward sign of a double structure, but each scale contains two 



FIG. 683. Cone-scales of Araucaria Cookii (A), A. imbricata (B), A. Bidwillii (C), 

 and A. excelsa (D, E) ; I, ligule. (After Seward and Ford.) . 



sets of bundles, the lower being normally orientated as in a leaf 

 and the upper vascular strands inversely orientated (cf. fig. 684, R). 

 The occurrence of these two sets of bundles is often quoted in 

 support of the view that the double cone-scale of the Abietineae 



