PLATE 33 



196 



197 







198 



196. Miltonia vexillaria. Transverse section of leaf at equal distances from apex and base, showing elongated keel, 



elongated cells below upper epidermis, large oval bundle. 



197. Miltonia roezlii. The same, showing much shorter keel, more acute angle at midrib, less elongated cells below 



the upper epidermis, and a small almost circular bundle. 



198. Miltonia bleuana. The same, showing keel fairly intermediate, also angle at midrib fairly intermediate, elon- 



gated cells of layer beneath upper epidermis as long as in M. roezlii, oval bundle nearly as large as in 

 M. vexillaria. 



199. Phaius grandifolius . Transverse section petiole of mature leaf, showing midrib bundle with upper and lower 



sclerenchyma sheaths. 



200. Phaius wallichii. The same, showing midrib bundle with continuous sclerenchyma sheath. 



201 . Phaius hybridus. The same, showing midrib bundle with upper and lower sclerenchyma sheaths, but more nearly 



joining each other than in P. grandifolius, an approximate mean between the two parents. 



