390 Transactions. 



sanguisorbce pilosa there are no papillae, but r the outer walls are 

 straight (fig. 5d). The papillae in this case probably serve the 

 same purpose as the wrinkled cuticle of other plants, to reflect 

 the light. They also affect the colour of the leaf. Stomata (st.) 

 occur on the under surface, and are partially covered by the 

 projecting papillae of the neighbouring cells. The chloren- 

 chyma (chlor.) is very sharply differentiated into palisade (pal.) 

 and spongy (sp.), each consisting of two layers of cells. The 

 distinction between the two tissues is so marked that a straight 

 line parallel with either epidermis could be drawn between the 

 two. In this respect also it differs from var. pilosa, where the 

 two tissues pass gradually one into the other (fig. 5d). The 

 palisade (pal.) consists of ordinary elongated cells with numerous 

 chlorophyll corpuscles arranged along the side walls. The spongy 

 tissue (sp.) is made up of regularly rounded cells with the cor- 

 puscles arranged on the upper and lower walls as seen in trans- 

 verse section, usually 5 in each cell (fig. 5e). The chlorenchyma 

 is interrupted at intervals by bands of colourless parenchyma 

 cells (par.) enclosing the smaller vascular bundles (v.b.). The 

 large midrib is found in the keel of the leaf surrounded by a mass 

 of rounded and colourless parenchyma cells. 



Epilobium confertifolium, Hook. f. 



" Stem slender, creeping, ascending at the tips. Leaves 

 small, suborbicular, densely foliaceous. Leaves opposite, often 

 imbricating, rather fleshy, glabrous or glabrate, obovate-oblong, 

 obtuse, shining, with few minute teeth, narrow at the base into 

 a short broad sheathing petiole ; minute hairs on the lower 

 surface."* 



" A creeping plant, frequently forms rather dense patches 

 on the surface of the ground ; the old shoots are prostrate and 

 dorsi-ventral, the leaves inserted on their flanks, the young 

 shoots are raised above the ground, and the leaves are in a spiral. 

 Roots about 46 cm. in length are given off here and there from 

 the prostrate stem."f (See fig. 6b.) 



Hab. — " On grassy banks and in moist places. "J It is found 

 on Auckland Island, growing on the sand-dunes and also on the 

 shady sides of the gullies between them, extending to the top of 

 the dunes, in association with a close turf of moss. " These 

 dunes are traversed by deep gulUes down which small streams 

 of water flow, the drainage of the swampy ground above. These 

 furnish plant-stations of considerable shade and moisture " ; and 



* Kirk (1899), p. 171. 



t Cockayne (1903), p. 238. 



% Hooker (1847), p. 11. 



