PLATE 32 



190 



193 



191 



194 



192 



,'".".> 



- .; - " ; 



- 



' 



195 



190. Dcndrobiuin fuullai/tiiuiiii. Transverse section of root, showing narrow velamen and small vascular cylinder. 



191. I>,'it(lrli,iini 'imliik. The same, showing wide velan;en and wide vascular cylinder. 



192. Dendrobium cybele. The same, showing velamen and vascular cylinder in width between the two parents 



193. Dendrobium findlayanum. Transverse section of leaf midway between apex and base, showing deep ridges, 



large lower epidermal cells and large bundle. 



194. Dendrobium nobile. The same, showing slightly larger ridges, large lower epidermal cells, and slightly smaller 



195. Dendrobium cybele. The same, showing faint ridges, smaller epidermal cells, and smaller bundle than in either 



parent . 



