XLIIl] 



ABIETINEAE 



153 



bands above and below each pit. Cones usually spherical, reaching 2-5' cm. 

 in length, with 6 smooth or tuberculate valves. In C. Madeayana the cones 

 are pyramidal and have 6 8 valves 1 . 



Widdringtonia. The adult foliage-shoots bear rather longer leaves in 

 decussate pairs 2 ; the twigs are cylindrical and not flat as in Thuya. In 

 quickly growing shoots the leaves may be spiral; they have no hypodermal 



FIG. 702 B. Sequoia gigantea. An unusually large cone. 

 (British Museum; nat. size.) 



layer like that in the leaves of Callitris. Spirally thickened tracheids occasion- 

 ally occur in the wood. The cones consist of 4 decussate thick and warty 

 valves, each scale bearing 7 8 winged seeds. 



I ABIETINEAE. Pinus. The needle-like leaves on short shoots are a 

 striking feature. In P. silvestris and many other species each short shoot 



1 Baker and Smith (10). 2 Rendle (96). 



