Suckling. — Leaf-anatomy of Trees and Shrubs on Port Hills. 185- 



When specimens of this tree are grown in the open, in gardens, the 

 leaves are a little smaller, rather curled up, and of a brighter yellowish- 



green . 



JC/ 



f.r/> 



Leaf-anatomy. — The upper epidermis is covered with a fairly thick 

 cuticle. If the upper epidermis be stripped off and stained with haema- 

 toxylin, the cuticle remains 

 colourless, and can be seen to ce/t.—f 

 have small openings here and e f 

 there, surrounded often by mark- P** 

 ings which seem to be arranged 

 in the shape resembling the 

 guard -cells of stomata. Over 

 the opening is a collection of a 

 granular or scale-like substance, 

 looking like broken pieces of the 

 cuticle, which it probably is, since 

 it turns yellowish - brown with 

 chlor-zinc-iodide, and yellow in 

 caustic potash, and is hardly 

 soluble in chromic acid. It is not 

 wax, being insoluble in ether. 

 To the naked eye it appears on 

 the upper surface of the leaf as 

 a white granular substance. The 

 upper epidermis is two cells 

 thick, the inner cells being larger than the outer, and with the outer 

 sometimes containing chlorophyll. The transverse walls of the outer 

 epidermal cells have conspicuous pits. The lower epidermis is one cell 



Fig. 6. — T.S. through the leaf of Olearia 

 Forsteri, with some of the stel- 

 late hairs on the under- surface 

 showing ; X 75. 



A p* 



s c 



Ftg. 



Fig. 8. 



Fig. 7. — Cuticle from the upper surface of Olearia Forsteri ; X 85. 

 Fig. 8. — Lower epidermis of the same, with the tops of the hairs 

 removed ; x 85. 



thick, and its cells resemble those of the upper, and also have a thick 

 cuticle. It is thickly covered with a layer of buff-co loured, two-celled 

 stellate hairs growing from the epidermal cells. The stomata are raised 

 above the other epidermal cells, and have large subsidiary cells. 



