Ser. RHoDOSPERME. Fam. Coccocarpee. 
Puate CIV. 
GIGARTINA ACICULARIS, Zamour. 
Gen. Cuar. Frond cartilaginous, either filiform, compressed or flat, irregu- 
larly divided; purplish-red; the avis or central substance composed 
of branching and anastomosing longitudinal filaments; the periphery 
of dichotomous filaments laxly set in pellucid jelly; their apices 
moniliform, strongly united together. ructification double, on dis- 
tinct plants; 1. external tubercles containing, on a central placenta, 
dense clusters of spores (favellidia) held together by a net-work of 
fibres ; 2, te¢raspores scattered among the filaments of the periphery.— 
Gieartina (Lamour.), from yiyaprov, a grape-stone ; which the tuber- 
cles resemble. 
GieartTina acicularis; frond cylindrical, filiform, irregularly branched, 
between pinnated and dichotomous; branches divaricating, curved ; 
ramuli few, very patent or recurved, subulate, often secund ; tubercles 
spherical, scattered on the branches. 
GiGARTINA acicularis, Zama. Ess. p. 49. Gaill. Dict. Sc. Nat. 53. p. 365. Duby. 
Bot. Gall. p. 953. Grev. Alg. Brit. p. 147. t. 16. Hook. Br. Fl. vol. 2. p. 300. 
Wyatt, Alg. Danm. No. 26. Harv. Man. p. 15. J. 4g. Alg. Medit. p. 105. 
Mont. Fl. Alger. p. 100. Kiitz. Phyc. Gen. p. 403. 
SpH#Rococcvs acicularis, 4g. Sp. dig. 1. p. 322. Ag. Syst. p. 237. 
Fucvs acicularis, Wulf. Orypt. Aquat. No. 50. Turn. Hist. t. 126. Sm. Eng. Bot. 
t. 2190. 
Has. On submarine rocks, near low-water mark. Annual. Winter. Rare. 
Cornwall, Mr. W. Rashleigh. Ilfracombe, Lupton Cove and Torquay. 
Mrs. Griffiths. Sidmouth, Miss Cutler. Jersey, Miss White and 
Miss Turner. Belfast Bay, Mr. Templeton. Valentia, abundant ; 
Kilkee, very rare, W. H. H. 
Grocer. Distr. Abundant on the shores of France and Spain. Mediterranean 
Sea. Indian ocean, Wight. Tasmania, Dr. Hooker. 
Descr. Root discoid, accompanied by decumbent, branching fibres. Fronds two 
to four inches high, as thick as small twine, densely tufted, and often matted 
together, very irregularly branched; sometimes the main divisions of the 
frond are tolerably regularly dichotomous, four or five times divided, with 
very patent axils, and long naked segments, forked at the tips, and bare of 
ramuli ; sometimes and more frequently, they are more or less regularly pin- 
nate, the main stem angularly flexuous, furnished with several, opposite or 
alternate, divaricating, or frequently recurved, elongated sub-simple, and 
nearly distichous branches, which are naked below, and more or less fur- 
nished in their upper part with very patent ramuli Ramuli various in 
length, sometimes short and spine-like, sometimes elongate and furnished 
with a second series, all tapering to an acute point. Swdstance firmly car- 
tilaginous, when first gathered long resisting the action of fresh water; 
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