Ser. Melanosperme;e. Fam. Fucea. 



Plate CCCLX. 



CYSTOSEIRA BARBATA, Ag. 



Gen. Char. Frond much branched, occasionally leafy at the base ; 

 branches becoming more slender upwards, and containing strings of 

 simple air-vessels within their substance. Receptacles terminal, small, 

 cellular, pierced by numerous pores, which communicate with im- 

 mersed, spherical conceptacles, containing parietal spores, and tufted 

 antheridia, Cystoseira {Ag,), — from kvo-tis, a bladder, and o-eipa, a 

 ; because the air-vessels are often arranged in strings. 



Cystoseira barbata ; stem cylindrical, covered with small, elliptical knobs, 

 each of which bears a very slender, many times dichotomo-pin- 

 nated, filiform branch ; air-vessels lanceolate, one or two together ; 

 receptacles small, elliptic-oblong, mucronate. 



Cystoseira barbata,"^. Sp. Alg. vol. i. p. 57 ; Syst. p. 283. Grev. Alg. Bmt. 

 p. 6. Hook. Br. M. vol. ii. p. 265. Harv. Man. ed. 1. p. 18 ; ed. 2. p. 17. 

 J. Ag. Sp. Alg. vol. i. p. 223. 



Fucus barbatus, Good, et Woodw. Linn. Trans, vol. iii. p. 128. Turn. Syn. 

 p. 80 ; Hist. t. 250. Sm. E. Bot. t. 2170. Stack. Ner. Brit. p. 83. t, 14. 



Eucus fceniculaceus, Gm. Hist. t. 2 A. f. 2 (!). Huds. Fl.Ang. p. 575. 



Hab. Rocks between tide-marks. Said to have been gathered by Hudson 

 in Devonshire ; but has not been recently found. 



Geogr. Distr. In the Mediterranean, Adriatic, and Black Seas. Brest, fide 

 Lenormand. 



Descr. Stem abont as thick as a swan's quill, simple or branched, truncate, 

 densely clothed with lateral branches. Branches rising from slightly in- 

 crassated bases, filiform, very slender, unarmed, decompound, repeatedly 

 pinnate, the lesser divisions dichotomous. Vesicles, when present, nume- 

 rous, elongate, ellipsoidal or lanceolate, two or more together forming a 

 chain in the branch. Receptacles terminating the dichotomous ramuli 

 linear, of small size, 1-2 lines long, or rarely 3-4 lines, tuberculated, un- 

 armed, or rarely with one or two spine-like processes, mucronate j the 

 mucro subulate. Colour brownish-olive, becoming very dark in drying. 



The figure here given has been prepared chiefly from a speci- 

 men collected at Catania in Sicily, and given me, many years 

 ago, by Professor Gussonc. I have seen no British specimen, 

 nor am I aware that any authentic evidence is on record of tin 

 finding of this plant on the British coast, although it is mentioned 



