Ser. RuoposPprMpa. Fam. Spherococcoidee. 
Puate XV. 
GRACILARIA MULTIPARTITA, J. 4. 
Gen. Cuan. Frond filiform or rarely flat, carnoso-cartilaginous, continuous, 
cellular ; the central cells very large, empty or full of granular matter; 
those of the surface minute, forming densely packed, vertical fila- 
ments. Fructification of two kinds, on distinct individuals ; 1, con- 
vex tubercles (coccidia), having a thick pericarp composed of 
radiating filaments, containing a mass of minute spores on a central 
placenta; 2, ¢etraspores, zoned or tripartite, imbedded in the cells of 
the surface. Gracinarta (Grev.),—from gracilis, slender. 
Gracinaria mu/tipartita; frond flat, tender, semi-transparent, brittle, dull 
purplish red, deeply cleft in an irregularly dichotomous or palmate 
manner; the branches linear-wedge-shaped, apices acute, tubercles 
conical, very prominent, scattered over the segments. 
GRACILARIA multipartita, J. dy. Aly. Medit. p. 151. 
GRACILARIA polycarpa, J. 4g. l. ec. p. 151. 
Procaria multipartita, Endl. 3rd Suppl. p. 51. 
Piocartra polycarpa, Hndl. l. c. p. 51. 
CHonprvs multipartitus, Grev. Syn. p. lvi. Harv. in Hook. Journ. Bot. 
vol. i. p. 155. 
SpH#Rococcws multipartitus, 4y. Sp. Alg. vol.i. p. 247. Ag. Syst. p. 212. 
SpumRococcus polycarpus, Grev. Se. Cryp. Fl. t. 352. 
RuHopoMENIA polycarpa, Grev. Alg. Brit. p. 87. Hook. Br. Fl. vol. ii. 
p- 289. Haro. Man. p.61. Wyatt, Alg. Danm. no. 108. 
Fucus multipartitus, Clem. Hist. p. 311. 
Fucus granatus, Turn. Hist. t. 215 (excl. syn. Lamz.). 
Fucus eruginosus, Zurn. Hist. t. 147. 
Has. On rocks and stones in the sea, in muddy places, chiefly 
estuaries ; near low-water mark, and at a greater depth. Very rare. 
Annual. August and September. Shore under Tait’s Hill, Plymouth, 
Miss Hill (1802); Mr. R. Sconce. Plymouth Sound, abundantly, 
Rev. W.8. Hore, Mr. J. W. Rohloff, Dr. Cocks. Whitsand Bay, Dr. 
Jacob. Dredged in Salcombe Bay, Mrs. Wyatt. 
GeoaRr. Distr. Shores of Europe from the south of England to Spain. Last 
coast of North America, from New York to Florida. California. West 
Indies (Miss Div). Pernambuco, Areschoug. Red Sea, Lord Valentia. 
Mauritius, Mrs. Telfair. 
Descr. Root, a thin spreading disk. Frond four to twelve inches long, fiat, 
cleft nearly to the base in an irregularly dichotomous manner ; sometimes 
vaguely divided, or palmate ; sometimes having the lesser segments secund, 
and often margined with horizontal lacinie. The breadth of the frond 
varies from half a line to more than half an inch; the thickness is com- 
monly nearly the tenth of an inch. When freshly gathered it is ‘thick, 
cartilaginous, tender, semitransparent, and very brittle”; but when dry, it 
becomes tough and shrinks considerably. The ¢udercles are large, conical, 
depressed at the apex, very prominent and abundantly dispersed over the 
frond. They contain, under a thick pericarp composed of vertical, densely 
