sanguisorbœ pilosa there are no papillæ, but the outer walls are straight (fig. 5d). The papillæ 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 papillæ of the neighbouring cells. The chlorenchyma (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 corpuscles arranged on the upper and lower walls as seen in transverse 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.”* Kirk (1899), p. 171. “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 4·6 cm. in length are given off here and there from the prostrate stem.”† Cockayne (1903), p. 238. (See fig. 6b.) Hab.—“On grassy banks and in moist places.”‡ Hooker (1847), p. 11. 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 gullies down which small streams of water flow, the drainage of the swampy ground above. These furnish plant-stations of considerable shade and moisture”; and