Ser. CHLOROSPERME.®. Fam. Confervee. 
Puate XXIV. 
CLADOPHORA REFRACTA, Kitz. 
Gen. Cuar. Li/aments green, jointed, attached, uniform, branched. Fruit, 
aggregated granules or zoospores, contained in the joints, having, at 
some period, a proper, ciliary motion. CrADpopHoRA—from kAddos, 
a branch, and Pope, to bear; a branching plant. 
Crapornora refracta; filaments capillary, somewhat rigid, tufted, bright 
green, very much branched ; secondary branches spreading on all sides, 
repeatedly divided, thickly clothed with very much spreading or re- 
flexed, short branchlets, which are pectinated with ramuli on their 
upper surface ; articulations twice or thrice as long as broad. 
CiapopuHora refracta, Kitz. Phyc. Gen. p. 267. 
Conrerva refracta, Roth. Cat. vol. ii. p.193. 4g. Syst. p.114. Harv. Man. 
p. 137. Wyatt, Alg. Danm. no 228. 
Haz. In rocky pools, left by the tide, near low water mark. Annual. 
Summer. Dunlecky Castle, Kilkee, W. H.H. Ilfracombe, Mrs. 
Griffiths. _Mangans Bay, Cork, Miss Bali. Giants’ Causeway, Mr. 
W. Thompson. Jersey, Miss Turner. Falmouth, Miss Warren. 
Mounts Bay, and Torbay, Mr. Ra/fs. Howth and Balbriggan, Wiss 
Gower. 
Grocer. Distr. Baltic Sea. Shores of the British Islands. 
Descr. Filaments densely tufted, 3-4 inches high, slender, rather rigid; the 
main stems often woven or matted together in rope-like bundles, the 
secondary branches free, spreading on all sides and much divided; the 
ultimate branchlets very patent or reflexed, frequently opposite, pectinated 
on their upper face. Very frequently a minute ramulus stands opposite to 
a pectinated branchlet, several of which follow each other in a secund 
manner along the stem. Colour a brillant yellowish green, peculiarly 
glossy when the plant is growing, and partially preserved in drying. Swd- 
stance rather harsh for so slender a plant, very imperfectly adhering to 
paper. 
rr 
If our reference to Roth be correct, the present plant was dis- 
covered by M. Trentepohl on the shores of the duchy of Oldenburg, 
about the year 1799, and has been detected since that period on 
many of the coasts of northern Europe. Specimens communi- 
cated to me by M. Areschoug, of Gottenburg, precisely agree with 
those from the British coasts. It was probably confounded by 
earlier British writers with C. a/éida, not having been recognized 
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