124 



BOTANY. 



vascular cylinder. This shows a number of white bars (xylem) 

 surrounded by a more delicate tissue (phloem) . 



On magnifying the section more strongly, the cells of the ground tissue 

 (G) are seen to be oval in outline, with thick striated walls and small in- 



Fia. 73. A, a club moss (Lycopodium) , x y 3 . x, cone, r, root. B, a cone, 

 x 1. (7, single scale with sporangium (sp.). D, spores: i, from above ; u, 

 from below, x 325. E, cross section of stem, x 8. /.&. fibro- vascular bundle. 

 F, portion of the nbro-vascular bundle, x 150. G, cells of the ground tissue, 

 x 150. 



tercellular spaces. Examined in longitudinal sections they are long and 

 pointed, belonging to the class of cells known as " fibres." 



The xylem (JP 7 , xy.) of the fibro- vascular bundle is composed of tra- 

 cheids, much like those of the ferns ; the phloem is composed of narrow 

 cells, pretty much all alike. 



