410 Transactions. 



bundle (v.b.). The vascular bundle is surrounded more or less 

 completely with a ring of large colourless parenchyma cells 

 (par.). 



Pratia arenaria, Hook. f. 



In Hooker's Handbook this plant is described as Pratia 

 angulata, var. arenaria. The leaves are orbicular, sinuate- 

 toothed, shortly petioled, and membranous.* 



Hab. — " Lord Auckland Group : creeping over the open 

 sandy shores of Enderby's Inlet, Rendezvous Harbour ; Lieu- 

 tenant H. Oakley."t 



This plant occurs associated with Epilobium conjertifolium 

 on the shady side of the gullies between the sand-dunes on 

 Enderby Island. J It is also found in the tussock meadow of 

 Antipodes Island. 



Anatotmj (fig. 20). — The leaf I examined was a young one, 

 but could be easily identified as Pratia by the angular margin. 

 The cells of the epidermis (ep.) were thin- walled, except beneath 

 the vascular bundle, where the walls were considerably thickened 

 (l.ep.). There was no cuticle developed, and stomata (st.) occurred 

 on both surfaces. The chlorenchyma was differentiated into 

 palisade (pal.) and spongy (sp.). The palisade tissue was just 

 one cell in thickness, and the cells were the regular palisade 

 form with chlorophyll corpuscles arranged on the side walls. 

 The rest of the chlorenchyma is composed of spongy tissue (sp.), 

 large thin-walled cells, not so densely filled with chlorophyll 

 and not very loosely arranged. Underneath the vascular bundle 

 is a mass of smaller-celled colourless tissue with thicker walls. 

 The bundle (v.b.) is surrounded by a well-marked endodermis 

 (endo.). 



The spongy tissue will most probably act as water-storage 

 tissue as well as the thicker-walled tissue beneath the bundle, 

 a necessary modification for a maritime plant such as this. 



Gentiana cerina, form v concinna, Kirk. 



' Leaves very thick, coriaceous, obovate or spathulate- 

 oblong, | in. to 1J in. long ; radical and cauline similar, 

 3 - nerved " ; form v concinna, " long, coriaceous, obtuse, 

 often recurved." "A most beautiful plant; remarkable for 

 the thick, trailing, leafy stems, bright-green, shining, succulent 

 foliage. "§ 



* Hooker (1807), p. 172. 

 t Hooker (1847), vol. i, p. 41. 

 J Cockayne (1903), p. 238. 

 § Hooker (1867), p. 191. 



