GIGARTINA. 139 



branched, branches and pinnae producing at their extremities 

 little tufts of partly derlexed ramuli. 

 North of Cornwall, Mrs. Griffiths. 



K. pulchellum ; frond capillary, compressed, tripinnate, 

 pinnae between linear and clavate, obtuse. Turn. 

 Bantry Bay, Miss Hutchins. 



x. claviferum ; frond sub-cylindrical, capillary, irregularly 

 divided, the ultimate ramuli or pinnulae obovate, edged with 

 minute, scattered teeth. 



Bantry Bay, Miss Hutchins. 



I*, clavatum ; frond capillary, between cartilaginous and 

 membranaceous, decumbent, creeping, ramuli in the form of 

 inversely-lanceolate or ovate leaves, much attenuated at their 

 insertion. 



South of England, frequent. Frith of Forth, Dr. Richardson. 



v. crinale ; frond setaceous, sub-cylindrical, somewhat di- 

 chotomously branched, sometimes three-forked at the top, 

 and bearing a few elliptical-oblong ramuli attenuated at their 

 insertion. 



East and south of England. Belfast Lough, Mr. Templeton. 



2. G. cartilagineum, L. ; frond several times pinnated, 

 the pinnae horizontal, alternate ; tubercles elliptical, mucro- 

 nate, terminating the smaller pinnulae. Grev. Hook. Br. Fl. 

 ii. p. 304. Fucus cartilagineus, E. Bot. t. 1477. 



On rocks in the sea. Perennial. A very doubtful native of our shores. 

 It was once found by Dr. Withering at Freshwater Bay, Isle of Wight, 

 where its presence was probably accidental. Frond 12 18 inches long, 

 rising from a mass of fibres ; the stems naked at base, in the upper part bi- 

 tripinnate, the pinna? and pinnulae alternate, gradually diminishing in size. 

 Colour a fine, dark purple, becoming scarlet, orange, yellow, and finally 

 greenish on exposure. Substance cartilaginous, horny when dry. This 

 plant is a native of the Cape of Good Hope. 



III. GIGARTINA. Lamour. [Plate 17, C.] 



Frond cartilaginous (filiform, compressed, or flat), irregu- 

 larly divided, purple or dark red ; the central substance com- 

 posed of rather lax, branching and anastomosing filaments ; 

 the periphery of dichotomous filaments distantly set in pellu- 

 cid jelly their apices moniliform and strongly united together. 

 Fructification : 1, external tubercles containing, on a cen- 

 tral placenta, dense clusters of spores (favellidia) held 

 together by a network of threads ; 2, tetraspores scattered 



