Fig. 17. Part of a transverse section through the stem of a Spider- 

 wort (Tradescantia Sellei), illustrating the arrangement of the fibro- 

 vascular bundles in a monocotyledonous stem ; e, epidermis, with a 

 stoma, sp ; R, cortex ; v, thickening ring, with the outer vascular 

 bundles, g l ; g l \ inner vascular bundles. (Magnified.) 



