Seii. MELANOSPERME.E. ( 7 ) Fam. FUCACE^. 



CYSTOSEIRA BARBATA.— ^^. 



Gex. Char. — Frond very coriaceous, occasionally leafy at tlie base, slender and filiform 

 upwards ; air-vessels formed by inflation of the frond ; receptacles terminal, very 

 small, containing numerous spherical conceptacles, communicating with the surface 

 by a minute pore, containing obovate spores attached to the inner surface, and 

 mixed with antheridia. Name from kikttis, "a box or bladder," and aetpa, "a 

 chain," because the air-vessels are continuous through the branches. 



Ctstoseira harhata. — Branches extremely slender, many times pinnate 

 or subdichotomous ; receptacles small, elliptic or oblong, mucronate. 



Ctstoseira larhata.—Ag. Sp. Alg. vol. i. p. 57 ; Ag. Syst. p. 283 ; Grev. Alg. Brit. 

 p. 6 ; Book Br. Fl. vol. ii. p. 265 ; J. G. Agardh, Sjx Gen. Alg. vol. i. 

 p. 223 ; Harv. P. B. plate 360 ; Jlarv. Man. p. 17 ; Harv. Syn. p. 14 ; 

 Atlas, plate 2, fig. 8. 



Fpcus harhatus. — Good. <£; Woodw. in Linn. Trans, vol. iii. p. 128 ; Turn. Syn. 

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

 p. 83, t. 14. 



Fucus fceniculaceus. — Gmel. Hist. t. 2 A, f. 2 ; Huds. Fl. Angl. p. 575. 



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

 shire ; but has not been recently found there. 



Geogr. Dist. — Mediterranean, Adriatic, and Black Seas ; Brest (fide Lenormand). 



Description. — Eoot, a flattened disc. Stem cylindrical, two or more 

 inches in length, and one to two lines in diameter, simple or slightly 

 divided, beset from the base with numerous long slender filiform 

 branches, very much swollen at the base, and for a short distance un- 

 branched, but covered with short spine-like processes, then repeatedly 

 branched in an irregular and alternately pinnate manner ; branchlets 

 erecto-patent, very slender, and scarcely swollen at the base. Air-vessels 

 scattered among the pinnules contained in the branchlet, elliptic or 

 lanceolate, single or two together. Substance coriaceous, very hard and 

 woody when old, not at all adhering to paper. Colour greenish olive, 

 almost black when dry. Receptacles small, lanceolate or oblong, with 

 few spine-like processes or naked, and terminated by a short subulate 

 mucro. 



This very pretty species, we fear, has little claim to be considered a 

 native of this country, although it is said to have been gathered on 

 om- southern shores many years ago ; but whether picked up on the 



