OF LOWER GREENLAND PLANTS. 



323 



medullary rays, can be seen m many places (PI. XXXII, fig. 2). 

 In the radial section of the trunk, where these bands are cut 

 transversely (text-fig. 109, B, .r), they show whitish zones like 

 those of the transverse sections of the vertically running 

 elements. The radial longitudinal sections of the trunk show 



it. 



Text-fig. 107. Colymbctes Ed-ward&i, sp. nov. Trangverse section showing 

 ten alternating zones of wood outside the peritnedullary zone pm. 

 y\>y* y*> y y^ vertically running xylein-series ; x v x v .r 3 , a- 4 , a-., 

 horizontally running xylem-series ; p., pith ; It., leaf-traces. Note 

 the curving out of the strands toward the leaf-traces, x 2 No 

 V. 6127/. 



transverse sections of these elements entirely similar to the 

 normal transverse sections of the vertically running elements, 



