CIIAR.E AUSTRALES ET ANTAKCTKLE. 195 



tlie seed is always placée! dircctly above tbe antheridium. To tins 

 division belong tbe most numerous and commonest species, as Ch. 

 fœtida, hispida, ceratophylla, aspera, frayilis, etc. AU tbese bave a 

 coated or invested stem ; but tbe same division contains also uncoated 

 species, as Chara coronata, which Ruprecht, in his additions to tbe 

 Russian Flora, séparâtes as a peculiar genus witb tbe name Charop- 

 sis* wbicb séparation is not applicable, some species varying witb 

 coated and uncoated stems. Tbe otber division of Cliara is tbe 

 subgenus Lychnothammis of Ruprecht, in wbich tbe antberidia are placed 

 in tbe inner part of tbe circle of foliola, and, being monœcious, there- 

 fore by tbe side of tbe seed. The species of tbis division are generally 

 uncoated, and bere are to be included Chara barbota and alopecaroidea. 



According to tbis division, also, tbe diœcious species can easily be 

 placed in tbe same arrangement. It is curions, tbat in New Holland 

 tbe greatest number of species seems to be diœcious, wbile in Europe 

 tbe monœcious species are far more numerous. 



I now introduce tbe separate species, enumerating ail subdivisions 

 of tbe gênera and subgenera, by wbicb it can be seen whicb of tbem 

 are represented in Australia, and whicb are not. 



Genus I. NITELLA. 



Subgenus A. Nitella. 



a, Nitella furcata ; foliis simpliciter (nunquam repetito) divisis, segmeutis 

 ex articulo uaico formatis. 



a, homophylla ; foliis verticilh 6-8 similibus. 

 /3, heterophylla ; foliis minoribus inter folia 6-8 majora inter- 

 jectis. 

 Of thèse divisions no species is found in Australia. To a, belong of European 

 species N.jlexilis, L., and N. syncarpa, Thuill. ; to /3, the South American N. clavata, 

 Bertero. 



b, Nitella mucronata ; foliis rarius simpliciter, plerumque repetito divisis, 

 segmeutis ultimis ex articulis 2, secundo plerumque mucroniformi, for- 

 matis. 



«, homophylla, ut supra. 

 The European species belonging to this division are N. transhicens, Pers., mucro- 

 nata, A. JBr., exilis, Amici, gracilis, Smith, tenuissima, Desv., batrachosperma, 

 Keicheub. ; the Australian species are the following : — 



* Charopsis, Kiitzing, is composed of Lychnothamnus, Ruprecht ; and Charopsis, 

 Ruprecht. 



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