Or LOWER GREENLAND PLANTS. 113 



grained medium has petrified the tissues very well. 

 The rather irregular growth-rings can be clearly seen 

 on the cut surfaces. 



38353 Ba. Figured, PI. VI, fig. 1. Transverse section showing 

 the large pith very beautifully. Hound this the 

 numerous primary bundles can be well seen, and out- 

 side the irregular and interrupted rings of secondary 

 wood through one side of which a branch is corning 

 off. In the primary bundles and in the earlier growth- 

 rings the resin-canals are very numerous and con- 

 spicuous. 



38353 Bb. Figured, PI. VII, fig. 1. A transverse section very 

 similar to the above. The resin-canals in the younger 

 zones of the wood show well, and arc filled with large 

 thin-walled tyloses, as figured. 



38353 B c. Figured, PI. VII, fig. 2. A part of a transverse 

 section similar to above, the pith and inner rings 

 are perfect, and the outer zones broken away. The 

 tyloses filling the resin-canals in some of the rings of 

 secondary wood are well seen and are illustrated. 



38353 Bd. Longitudinal section of the above, in oblique tan- 

 gential direction. The height of the rays, etc., can 

 be seen. 



38353 B e. Figured, text-fig. 26. Median radial section, passing 

 through the pith, primary wood, and an outgoing 

 branch. Parts of the section cut the resin -canals 

 slightly obliquely, and there the thick-walled and 

 pitted epithelium-cells can be beautifully seen, as well 

 as the large tyloses filling the canals. 



38353 Bf. Figured, text-fig. 27. Itadial longitudinal section 

 showing the details of the medullary ray-cells very 

 well in places, as is illustrated. The thickened walls 

 with their "abietinean pitting," the large pores of 

 the ray -parenchyma, and the irregular outline of the 

 ray-tracheids as well as their bordered pits can all be 

 clearly seen. Between the rays, and connecting with 



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