200 CHARGE AUSTRALES ET ANTARCTICiE. 



12. N. Antarctica ; monoica(?); caule elongato, nodis inferioribus 

 valde incrassatis ; verticillis remotis, superioribus laxe congestis, e 

 foliis 6-9 inaequalibus, aliis indivisis, aliis simpliciter divisis, seg- 

 mentis lateralibus termina]! brevioribus, omnibus 4-5-articulatis 

 obtusis; seniinibus in foliorum geniculo primo congestis, magnis, 

 fasciis 8. 



Kerguelen's Land, collected by Dr. Hooker in 1840. 



The spécimens in Sir William Hooker's herbarium are in a state of 

 decay, having lost part of their leaves and tlie greatest part of the seeds ; 

 I therefore cannot entirely décide if tliis species is really distinguished 

 from N. nidifica, winch is peculiar to saline water of the north of 

 Europe, and particularly to the Baltic. The Antarctic plant seems to 

 differ from it by a more slender habit, thicker nodes of the stem, and 

 particularly by the larger seeds, which surpass in size those of ail 

 other Nitellas, the dark red-brown nut being £ millim. long. Finally 

 the seeds appear to be placed only on the leaves, and not, as in N. nidi- 

 fica, also at the base of the whorl. 



GenusII. CHARA. 



Subgenus A. Lychnothamnus. 



13. Ch. macrqpoffon. 



A. Br. in Linnœa, 17, ^.116. Fiant. Preiss. 2, p. 147. 



Swan River, collected by Preiss and Drummond (No. 4 et 5 in herb. 

 Hook.) 



Ainong Drummond's spécimens of this most curious species there is 

 a little dwarf variety, of only three inches in length. To the description 

 formerly given 1 will add the measure of the nut of the seed, length 

 .64-.74 m., breadth .4S-.52. 



The European species of this subgenus are Ch. barbata, Meyer, alopecuroidea, 

 Del., and Wallrothii, Ruprecht. 



Subgenus B. Chara. 



a, Chara haplostephanœ, stipularum ad basin verticilli série simplici. 

 a, ecorticatœ, caule foliisque ecorticatis. 



14. Ch. australis ; dioica, flexilis et pellucida, omnino ecorticata ; 

 caule valido ; verticillorum foliis 6 validis, 3-articulatis, articu- 

 lis subaequilongïs, ultimo obtuso minutissime umbonato vel apicu- 

 lato ; stipulis ad basin verticilli minimis, adpressis, inconspicuis ; 



