64 Sykes . — The Anatomy and Morphology of Tmesipteris . 
II. External Features. 
(i) Vegetative regions. The underground portion of Tmesipteris runs 
more or less horizontally and forks at intervals. Generally one of the 
branches thus formed remains small, while the other continues as the main 
axis. Rhizome apices were very rare in my material ; they are easily 
distinguished by their smoothness, while the rest of the rhizome is covered 
Figure I. T. tannensis. Figure II. T. Icinceolata (f nat. size). 
with soft hairs. One apex was divided into three lobes, but investigation 
of the vascular structure revealed no branching of the stele, and I can offer 
no explanation of this unusual case. 
In every specimen examined the anterior end of the rhizome is 
directly transformed into a single aerial shoot, but Dangeard describes plants 
