Betts. — Autecology of Plants of Peridotite Belt, Nelson. 



299 



Under the upper epidermis there are a few cells which have thickened 

 walls, and above the lower epidermis there are 2 rows of roundish cells 

 which contain chloroplasts and which have their walls slightly thickened. 



Fig. 25. — Senecio bellidioides. Ui^per epidermis of leaf ( X 36). 

 Fig. 26. — Senecio bellidioides. Lower epidermis of leaf ( x 36). 

 Fig. 27. — Senecio bellidioides. Transverse section of scape ( X 36). 



The rest of the midrib is occupied by a mass of large, closely packed, 

 thin-walled, more or less polygonal cells. These cells form a water-storage 

 tissue. 



