XXIV] 



ANATOMY 20I 



A 



Fig. 482. Habit oiPlalyzoina tnicrophylla R.Br., 

 showing heterophylly, and the hairy invest- 

 ment of the abbreviated rhizome. The small 

 leaves near the apex are sterile, the longer 

 leaves fertile. (From specimen coll. Prof. 

 Baldwfin Spencer. Boorrooloo. N.T., Aus- 

 tralia. 1902. \ Natural size.) 



^^t^xa^c- 



Fig. 483. Platyzoma. Transverse section of rhizome, 

 A, showing soleno-xylic stele : B, C, showing the proto- 

 stelic origin of the small leaf-traces. (After J. M. L. 

 Thompson.) 



