— a 
Ser. CHLOROSPERME. Fam. Confervec. 
Pratt CXXXV. 
CLADOPHORA ARCTA, Kitz. 
Gen. Coan. Fi/aments green, jointed, attached, uniform, branched. Fruit, 
aggregated granules or zoospores, contained in the joints, having at 
some period a proper ciliary motion. CraporHora (K7tz.),—from 
kdddos, a branch, and popéw, to bear. 
CraporHora avcta; filaments forming broad, starry tufts, of a brilliant 
green colour, much branched, and more or less matted together below; 
branches straight, crowded, very erect; ramuli appressed, opposite or 
alternate, scattered ; articulations in the older parts once or twice as 
long as broad, in the young (upper) branches many times longer. 
CiapopHora arcta, Kiitz. Phyc. Gen. p. 263. 
CiapopHora vaucherieformis, Kitz. 1. c. p. 263. 
CiapopnHora centralis, Kvitz. J. c. p. 269. 
Conrerva arcta, Dillw. Conf. Suppl. p. 67.t. £. E. Bot. t. 2098. Lyngb. 
Hyd, Dan. p.157. Ag. Syst. p. 118. Harv. in Hook. Br. Fl. vol. ii. 
p. 359. Harv. in Mack. Fl. Hib. part 3. p. 230. Harv. Man. p. 139. 
Conrerva centralis, Lyngb. Hyd. Dan. p.161. t.56. Ag. Syst.p.111. #7. 
Dan.t.1777. Harv. in Hook. Br. Fl. vol. ii. p. 358. 
Conrerva vaucherieformis, dy. Syst. p. 118. 
Has. On exposed sub-marine rocks from half-tide level to low-water mark, 
Perennial? Spring, summer and autumn. Frequent on the British 
shores from Orkney to Cornwall. 
Gzoer. Distr, Abundant on the Atlantic shores of Europe and north America. 
Baltic Sea. Falkland Islands, Dr. Hooker. 
Descr. Tufts rising from a spongy, cushion-like base, spreading in a circle, 
more or less split, in a starry manner, into several minor bundles, which 
are either simple or divided in a fan-like or palmate manner above. Fila- 
ments slender, flaccid, much branched, their lower portions more or less 
matted together according to age, connected by irregular, root-like fibres, 
which issue from the lower branches, and twine among the neighbouring 
filaments ; branches very straight, and erect, somewhat pencillate, repeatedly 
divided, the lesser divisions alternate, or scattered, all very straight and 
erect. In young specimens, and also in those of the second season, after 
the new growth commences, the uppermost branches are much produced, of 
a very vivid green colour, and distinguished by having very long joints ; at 
a later period these disappear, and the tufts become fastigiate, and very 
matted together, like a sponge. Colour a rich, deep green, occasionally 
somewhat glaucous, fading and losing much of its gloss in the herbarium. 
Substance, when young, tender and flaccid, closely adhering to paper ; when 
old, more or less membranaceous, and very imperfectly adhering to paper. 
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