114 



CONIFERALES (EECENT) 



[CH. 



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

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

 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. Bidvnllii (C), 

 and A. exceUa (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, E). 

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

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



