Hereiott. — Plant* from the Southern Islands. 405 



of small rounded cells with numerous chlorophyll corpuscles. 

 This answers to the palisade tissue of other dorsi-ventral leaves, 

 and is marked pal. These teeth are bent up at right angles, 

 so that both sides are equally illuminated, hence the isolateral 

 structure of the leaf. Another peculiarity is the presence of 

 numerous pits or depressions, probably glandular, which are 

 scattered over the leaf. These, as seen in fig. 15&, are walled 

 in by epidermal cells much longer than the ordinary cubical 

 ones, and at the base bounded by one or two smaller cubical 

 cells. There is a thin cuticle (cut.) developed. The vascular 

 bundle is surrounded by a well-marked endodermis (endo.), 

 with walls considerably thickened. This is again surrounded 

 by a layer of colourless parenchyma (p.s.) similar to the central 

 water-storing tissue, the parenchyma sheath. 



Cotula propinqua, Hook. f. 



This plant differs from Cotula lanata in the appearance of 

 the rosettes of leaves : they are much more open and spreading. 

 The leaves themselves are larger, as will be seen by comparing 

 figs. 15d and 166. The teeth into which the blade is divided do 

 not overlap as in the case of Cot. lanata, and so the leaf appears 

 flatter. 



In the anatomical structure (figs. 16a, 16&, 16c) there are 

 one or two points of difference. The cells of the palisade tissue 

 (pal.) are larger in Cot. propinqua, and the corpuscles are also 

 larger. The internal spongy tissue (sp.) is not so open, and the 

 constituent cells are smaller, than in Cot. lanata. The stomata 

 (st.) (fig. 16c) are well developed ; the guard-cells are kidney- 

 shaped, and contain a very regular row of chlorophyll corpuscles, 

 giving a beaded appearance. 



Pleurophyllum speciosum, Hook, f., Fl. Antarc. 



" Leaves all radical, 6 in. to 18 in. long, 5 in. to 10 in. broad, 

 usually appressed to the ground, forming a huge rosette, broadly 

 ovate or obovate or unequally rhomboid, rounded at the apex 

 or shortly acuminate, thick when fresh, with 15-20 longitudinal 

 ridges, loosely tomentose below, villous or setose above, the 

 bristles being intermixed with rather long moniliform hairs."* 



Hab. — " Lord Auckland Group and Campbell Island ; chiefly 

 found upon wet banks and in marshes near the sea, but also 

 ascending to the tops of mountains in a stunted form."f 



On the Auckland Islands Kirk (1891, p. 220) describes the 

 plant as covering acres, giving a unique effect, approaching the 



* Kirk (1899), p. 277. 



t Hooker (1847), vol. i, p. 31. 



