Herriott. — Plants from the Southern Island*. 401 



senting a scalariform appearance similar to the thickenings of 

 the scakriform tracheites of ferns. The chlorenchyma is dif- 

 ferentiated into palisade (pal.) of two layers and spongy (sp.) 

 of three or four layers of cells. The palisade cells are very large 

 in comparison with those of the spongy tissue, elongated at right 

 angles to the surface, being about twice as long as broad, with 

 few but large chlorophyll corpuscles. The spongy tissue consists 

 of small irregularly shaped cells, sparingly filled with large cor- 

 puscles, and leaving comparatively few air-spaces. These border 

 directly on the lower epidermis. The vascular bundles are found 

 of varying size in a transverse section, but all are surrounded by 

 an endodermis of round cells. The larger ones consist of a dark 

 xylem and a light-coloured phloem, with a band of cells inter- 

 mediate in colour between the two (fig. 12a). Underneath the 

 larger bundles also is a ridge of tissue composed of more or less 

 rounded and thick-walled cells. The cells of the epidermis ad- 

 joining them are larger than the other cells of the lower epidermis, 

 and, as I mentioned before, considerably elongated into hair- 

 like outgrowths. 



Abrotanella rosulata, Hook. f. 



" A small, densely tufted, moss-like plant. Leaves imbri- 

 cating, patent or recurved, rigid, coriaceous, ^ in. to ^ in. long, 

 narrow, ovate or lanceolate, acute, concave above."* 



" It has wiry stems, creeping at first, but finally erect, covered 

 more or less with old dead leaves. The terminal leafy portion 

 of the shoots measures 1*3 cm., and consists of spreading imbri- 

 cating leaves, the uppermost of which form a stiff, dark-green 

 rosette about 1*3 cm. in diameter, the individual leaves so spread- 

 ing outwards as to have their upper surface horizontal. The 

 individual leaves are linear or linear-lanceolate, sheathing at the 

 base, which is frequently purplish-rose-coloured, coriaceous, con- 

 cave on the upper surface.""!' 



Hob. — Kirk mentions it in his account of the Campbell 

 Island flora : " The endemic A. rosulata occurred sparingly on 

 exposed rocks, but was not observed below 1,000 ft." % Dr. 

 Cockayne places it amongst the subalpine rock vegetation of 

 Campbell Island, forming " stiff rosettes " on " the face of a pre- 

 cipitous rock facing north-west at an altitude of about 538 m." 

 (p. 282). It may be classed, therefore, as a rock-plant with 

 Phyllachne clavigera, Colobanthus subulatus, and its relative, 

 Abrotanella spathulata, and with them presents certain xero- 

 phytic characters in its anatomical structure. 



* Hooker (1864). 



t Cockayne (1903), p. 283. 



% Kirk (1891), p. 223. 



