OF LOWER GREENLAND PLANTS. 



TiJ 



and at a higher level of the leaf as two patches, one on either side 

 of the resin-canal (PI. II, fig-. 2, tr.). The cells are roundish 

 or hexagonal, with thickened and apparently pitted walls, but 

 as they all appear to be cut in good transverse section the 

 character of their wall-perforations cannot clearly be made out. 

 They are easily distinguished from the mesophyll of the leaf by 

 their smaller size, compact arrangement, and thickened walls, 



Text-fig. 10. Sequoia giganteoides, sp. nov. Part of the leaf in trans- 

 verse section, c., cuticle ; e., epidermis ; sc., ecleriseci hypoclerm ; 

 p.l., palisade-layer ; m., mesophyll ; tr., transfusion-tissue. No. SB. aa 

 (Stopes Coll.). 



as can bo seen in transverse section (PI. II, figs. 2, 3, & text- 

 tig. 16, tr.). 



The mesophyll of the leaf is very large-celled, the inner cells 

 being irregularly roundish and tending- to break down, the 

 outer series of cells forming a regular phalanx of palisade-cells 



