OF LOWER G11EENSA.NU PLANTS. 



215 



preserved in a number of the tracheids, the pores of the pits 

 are circular (text-fig. 61). In a few cases the tracheid-lumen 

 is filled with blackish contents which may be resin, but there 

 are no specialised resin-tracheids. Wood-par encliyma containing 

 resin is a noticeable feature of the wood (PI. XX, fig. 1, r.p. ; 

 text-figs. 60, 01, & 62). The elements are thin-walled, tho 

 same size as the tracheids tangentially, but as a rule narrower 

 than the tracheids in a radial direction. In a few cases they 



.m r. 





Text-fig. 2.Podocarpoxylon wotmrnense, sp. nov. Tangential section of 

 the wood showing the medullary rays, with some resin-containing 

 cells, mr. ; t., tracheids with radial pitting; a., autumn tracheids with 

 small pits on tangential walls ; p., xjlem-parenchyma with resinous 

 contents. No. 5456 6. 



are tangentially the size of two tracheids, and are then very 

 conspicuous in longitudinal section. The vertical height of 

 these cells varies greatly ; the transverse walls are at right 

 angles to the vertical walls. Resin-canals are absent. 



