270 



with ferric chloride. The tannin in these cells, and also in Geijera parviflora, 

 has a solid, glassy appearance. In some cases the tannin masses are broken 

 and scratched by the microtome knife. This coincides with that structure which 

 Lloyd (1922, a and b) has described in various species. From its occurrence in a 

 definitive tissue such as medullary ray cells — the latter being the only parenchy- 

 matous tissue besides the chlorenchyma — it appears that the tannin performs 

 some other function in the plant than that of an excretory product (vide Lloyd, 

 1922, b). 



- Geijera parviflora. (Figs. 12 and 13.) 



The leaves of Geijera parviflora are linear, obtuse, and somewhat thick. 

 There are practically no structural differences between the dorsal and ventral 

 sides. The chlorenchyma consists of short palisade cells. A peculiar feature is 

 the relatively large number of cells which contain tannin masses ; these cells 

 are scattered among the assimilatory cells from which they do not differ in 

 shape. The tannin masses are, in most cases, broken and scratched by the knife, 

 and appear to have shrunken away from the cell walls. No fresh material was 

 available to examine its condition in the living plant (Lloyd, 1922, loc. cit.). 



Fig. 12. 



Transverse section of leaf of Geijera parviflora. 

 f.v.b., Fibro-vascular bundle ; e.g., Oil-gland ; s.v., Secondary vein. 



x21. 



Fig. 13. 



Transverse section through a stomate of Geijera parviflora showing heavily cutinised 



epidermal cells, g.c, Guard cell ; c, Collar, x 760. 



A characteristic feature of Geijera parviflora is the large oil glands which 

 are found throughout the mesophyll. These are spherical and numerous. The 

 midrib and secondary veins are simple bundles with relatively large phloem cells. 



