198 CHARÆ AUSTRALES ET ANTARCTICA, 
7. N. heterophylla. 
Chara heterophylla, 4. Br. in Linnea, 17. p.113. Plant. Preiss. 2. p. 145. 
Of these two species the fructification is unknown. 
8. N. congesta. 
Chara congesta, ^ EF Prodr. p.346. A. Br. in Linnea, VT. p. 114. 
Plant. Preiss. 146. 
One of the most abis and easily distinguished species, which, 
since Robert Brown, seems not to have been collected again. It is 
probably dicecious, but I have not seen the male plant. 
ó Nitello wget foliis simpliciter, rarius repetito divisis, segmentis 
ulti -articulatis. (Omnes hom ophyllz. 
Europe possesses no species of this division, Australia two very distinguished 
ones ; the an Antarctic species is allied in its habit to some species of the section 
Mucrona 
E N, oe dioica ; caule validiore elongato ; verticillis sterilibus 
remotissimis, e foliis elongatis apice trifurcatis, segmentis brevis- 
simis depauperatis 3-4-articulatis ; verticillis fertilibus minimis, den- 
sissime congestis, capitula minima oblonga gelatinosa, terminalia et 
bum formantibus, e folis 8-9 prope basin simpliciter divisis, 
entis 4—7, sequalibus, 3—4-artieulatis, articulo primo elongato, 
Siena abbreviatis, ultimo obtusiusculo ; seminibus solitariis, 
coronula breviuscula, fasciis 8. 
Chara gelatinosa, 4. Br. in Linnea, 17, p.115. Plant. Preiss. 2. p. 146. 
B. microcephala ; caule foliisque tenuioribus, foliorum sterilium seg- 
mentis elongatis, capitulis fructiferis minimis subglobosis. 
Canning un Preiss, 1841, No. 1880; at the Swan River, Drum- 
mond, No. 12, in herb. Hes B. at the Swan River, Drummond, 
No. 13, in "ed Hook. 
One of the most singular species, in which the difference between the 
sterile and fertile whorls is the most remarkable. While the sterile 
leaves attain the length of one inch, the fertile ones, which form the 
little heads, are only about 4 millimetre long, the whole heads being only 
1 or 13 m. in diameter. The gelatinous covering of these little heads 
is in no species more developed. The seeds belong to the least in the 
genus, although they appear very large in comparison to the whorls 
which produce them ; the dark red-brown nut of them is about .20 m. 
long. The antheridia are considerably larger than the seeds, being 
scarcely surpassed by the segments of the leaves which bear them 
