Cross. — Ohservrifions on some New Zeahnul Halop/ti/fe'^. 



569 



B. — The leaf (fig. 16, c) here is about half as thick as in A. The same 

 figures and, letters are used as in A, and, only points of dift'erence are noted. 



Epidermis is not cuticularised. and no striations appear on the surface. 

 The epidermal cells are elongated in a direction parallel with the longitudinal 

 axis. There are very few stomata. 



Mesophyll : {a.) There are only 2 layers of closely packed cells, (b.) Only 

 5-6 layers of loose mesophyll, and the spaces are larger and more numerous, 

 (c.) 2 layers of closely packed cells similar to those in («), so that the structure 

 of both sides of the leaf is the same, as might be expected in a submeroed 

 plant. 



Fig. 16. — Cotula coronopifolia. 



a. T.S. leaf from meadow, x 55. b. T.S. leaf from plant grown in a pot, x 55. r. T.S- 

 submerged leaf, X 55. d. Surface-view of upper epidermis of leaf e. Fig. 9. 

 highly magnified. 



The midrib is smaller, has a more prominent phloem, and the xvlem 

 elements have not such thickened walls. There is no sclerenchyma. 



Comparison of Plants grown at Canterbury College with those 



FROM their Natural Habitat. 



The following plants were planted at Canterbury College, some in the- 

 flower-beds and some in the greenhouse : — 



1. Salicornia australis. 



2. Spergidaria media. 



3. Apium 'prostratum. 



4. Samolus repens. 



5. Selliera radicans. 



6. Cotula dioica. 



7. Cotula coronopi folia. 



