Greensill. — Leaf-structure of Coprosma. 349 



phyll corpuscles (chl.) being rather closely crowded, espe- 

 cially towards the centre ; beneath the palisade parenchyma 

 is typical spongy parenchyma (sp.), with numerous chloro- 

 phyll corpuscles (eld.) scattered irregularly. On the lower 

 surface is an epidermis of small roundish cells (I. ep.), with a 

 thinner cuticle than that of the upper, and numerous stomata. 

 The guard-cells (g.) project slightly, are small and pear- 

 shaped ; the subsidiary cells (s.) are slightly modified 

 epidermal cells. The epidermis of the pit (p. ep.) is similar 

 to that of the lower surface, and has a cuticle (cu.). There 

 are numerous projecting hairs (h.) consisting of two or three 

 narrow elongated cells. Next to the epidermis are two layers 

 of round colourless cells (c. I.), and around these is the spongy 

 tissue of the leaf. 



Coprosma cunninghamii. Hook, f., Handbk., 113. 



The under-surface of the leaf is seen in fig. 20. The pits 

 (p.) are arranged regularly in the axils of the midrib (in.) and 

 primary veins. The structure of the leaf in transverse section 

 (fig. 25) is as follows : On the upper surface a cuticle (cu.) with 

 slightly irregular outline ; next an epidermis (ep.) of rather 

 large cells elongated in a transverse direction ; beneath these 

 two or three layers of typical palisade cells with the usual 

 concents, and the chlorophyll corpuscles (chl.) rather closely 

 crowded ; beneath this, again, typical spongy parenchyma 

 (sp.), with less crowded though still numerous chlorophyll 

 corpuscles; then the epidermis of the lower surface (I. ep.), 

 consisting of small cells, and with a cuticle (cu.) and 

 numerous stomata (st.). The guard-cells (g.) are pear-shaped 

 as usual, the subsidiary cells (s.) slightly modified to fit into 

 them. There are numerous hairs (h.) at the opening of the 

 pit, as well as inside. They are multicellular, the individual 

 cells of each being narrow and elongated. The epidermis of 

 the pit (p. ep.) is similar to that of the lower surface. In 

 immediate contact with it is the spongy tissue of the leaf, no 

 colourless layers being present inside the epidermis. 



Coprosma rotundifolia. A. Cunn., Precurs., n. 472. 



The under-surface of the leaf is seen in fig. 21. The pits 

 are few in number, arranged in the axils of the midrib (in.) 

 and primary veins. The leaf is thin. The structure in trans- 

 verse section (fig. 26) is as follows : On the upper surface of 

 the leaf is a thin cuticle (cu.) and numerous hairs composed 

 of two or three narrow elongated cells ; an epidermal layer 

 (ep.) of large cells, elongated in a transverse direction, and 

 probably able to function .as a storage layer for water. Be- 

 neath this there are two or three layers of palisade cells (p.p.), 

 broader than usual, and with their numerous chlorophyll 



