146 



CONIFEEALES (RECENT) 



[CH. 



CUPBESSINEAE. The absence of resin-canals in the xylem is a feature 

 shared by other families; but in the occurrence of xylem-parenchyma in 

 different regions of the wood the Cupressineae differ as a rule from the Abie- 

 tineae, though this is not a constant distinguishing character. The pits in 

 the field vary from 1 to 6 or 8 in some genera, e.g., Taxodium and Glypto- 

 strobus^ : Gothan^ applies the term Cupressoid to medullary-ray pits character- 



FiG. 698. Araucariu exceha. A, Mature form. B, Seedling. (Jnat. size.) 



ised by an upper and lower border (fig. 693, H) but, as pointed out on a previous 

 page, the position of the pore is by no means constant and in Taxodium the 

 ray pits are fairly large and almost simple. 



Cupre^sus and Chamaecyparis. By Beissner^ and many other authors both 

 names are used in a generic sense, though Masters regards Chamaecyparis as 

 a subsection of Cupressus. One distinguishing feature is the presence of more 



1 Kleeberg (85). 



'- Gothan (05) p. 47. 



^ Beissner (91). 



