GIGARTINA. 139 



branched, branches and pinnae producing at their extremities 

 little tufts of partly detiexed ramuli. 

 North of Coniwall, Mrs. Griffiths. 



X. pulchelliim ; frond capillary, compressed, tripinnate, 

 pinnae between linear and clavate, obtuse. Turn. 

 Bantiy Bay, Miss Hutchins. 



K claviferum ; frond sub-cylindrical, capillary, irregularly 

 divided, the ultimate ramuli or pinnule obovate, edged with 

 minute, scattered teeth. 



Bantry Bay, Miss Hutchins, 



iw. 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. cariilaginemn, L. ; frond several times pinnated, 

 the pinna) horizontal, alternate ; tubercles elliptical, mucro- 

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

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



On rocks in the sea. Perennial. A very doul)tful 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 pinniE and pinnulas 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. Laraour. [Plate 17, C] 



Frond cartilaginous (fihform, 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. 

 Fructi-fication : 1, external tubercles containing, on a cen- 

 tral placenta, dense clusters of spores (favellldia) held 

 together by a network of threads ; 2, tetraspores scattered 



