Suckling. — Leaf-anatomy of Trees and Shrubs on Port Hills. 187 



from a young tree growing in a rather damp, shady situation. The follow- 

 ing is a description of the anatomy of the first : — 



Epidermis : The cuticle is conspicuous, and of a bright-green colour 

 on both surfaces, and both lower and upper epidermes are double, the; 

 inner cells being larger than the outer. Stomata are numerous, small, only 

 in the lower epidermis, difficult to see in transverse section. The guard - 

 cells contain oil-drops, and have no special subsidiary cells. Hairs are 

 altogether absent. 



Mesophyll : The palisade layer is three or four cells deep, the cells 

 being rather small, and containing abundant chloroplasts distributed 

 throughout the contents of each cell, not arranged along the walls. The 

 spongy parenchyma is rather deep, with the average amount of air-space, 

 and the chloroplasts are not quite so abundant as in the palisade layer. 

 No sclerenchyma is developed in the leaf. Clusters of crystals of calcium 

 oxalate occur in the mesophyll. (See fig. 9, a, b.) 



The leaves taken from a shady position were much thinner. The cells 

 of the palisade layer were rounded, but about the same size as in the former 

 case, and more loosely packed. Air-spaces were a little more numerous, 

 perhaps, but this was not so well marked as the difference in the palisade 

 layer. The cuticle was slightly thinner, and colourless. 



Tupeia antarctica Cham. & Schl. 



Tupeia antarctica Cham. & Sol. is perhaps the most abundant of the 

 three semi-parasites present. It is a shrub of about the same size and 

 habit as Loranthus micranthus, but has smaller leaves, variable in size, of 

 brighter colour, and also isobilateral. 



J C. O J 



Co/, sir 



Fig. 10. 



Fig. 11. 



Fig. 10. — T.S. of the leaf of Tupeia antarctica ; x 40. 

 Fig. 11. — Epidermis of the same ; x 150. 



Leaf-anatomy . — The leaf-anatomy of Tupeia antarctica and of Loranthus 

 micranthus seem to be very similar, but this may be due to their belonging 

 to the same family as much as to their having adopted the same mode of 

 life. 



The leaf of Tupeia antarctica is isobilateral, and shows no differentiation 

 of mesophyll into palisade layer and spongy parenchyma. The cuticle is 

 thick, and striated, especially near the stomata. The epidermis is com- 



