CALAMUS 



75 



Coll 





FIG. 26. Calamus. A, transverse section of rhizome showing epidermis (Ep) 

 and collenchyma (Coll.). B, cells of cortex showing isodiameteric, thin- 

 walled parenchyma (P) separated by large intercellular spaces (7) and an oil 

 cell (O) ; C, section of part of stele of rhizome showing cortical parenchyma 

 (C); cells of endodermis (End) with thin walls and Casparyan spots (S); 

 stereomatic pericycle (St)', leptome (L) and vessels or tracheae (H); D, 

 portion of pith showing starch-bearing parenchyma (P) ; intercellular spaces 

 (I) and large oil cells (0). E, a leptome strand from the pith of the rhizome 

 showing leptome (L) surrounded by sclerenchymatous fibers or stereome. 

 F, a stereome strand from the pith of the rhizome consisting entirely of 



