312 



BLACK PINE 



tip yellowish and hard, semi-terete or slightly channelled 

 above, margins minutely serratulate, persisting 3 4 or 

 even 6 years. Dying leaves yellow. Basal sheath 1*5 cm., 

 whitish or yellowish, becoming shorter and darker. Resin- 



Fig. 120. Austrian Piue, Pinus Laricio, var. Austriaca, p. 311 (Wi). 



canals numerous, all round the leaf, each encircled by 

 sclerenchyma. Venation simple. Vascular bundle double. 

 [Other allied varieties are P. pyrenaica and P. Cor- 

 sica.] 



A A Leaves at least 15 30 cm. long 

 d? Leaves 15 20 cm. long. 



Pinus Pinea, L. Stone Pine. Large tree, umbrella- 

 shaped when old. Leaves extended, 15 18 cm. (8 



