Ser. Melaxospermeje. Fam. Fucea. 



Plate CXX1I. 



CYSTOSEIRA FCENICULACEA, Grev. 



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, cellu- 

 lar, pierced by numerous pores, which communicate with immersed, 

 spherical conceptacles, containing parietal spores, and tufted anther idi a. 

 Cystoseira (Ag.), — from kvo-tls, & bladder and acipa, a chain; because 

 the air-vessels are often arranged in strings. 



Cystoseira fcenictdacea ; stem compressed ; branches long, slender, rough 

 with hard points, repeatedly dichotomo-pinnate ; air-vessels small, 

 solitary or two together, elliptical oblong, placed near the tips of the 

 branches j receptacles minute, smooth, linear-lanceolate. 



Cystoseira fceniculacea, Grev. Alg. Brit. p. 6. Hook. Br. Fl. vol. ii. p. 265. 

 Wyatt, Alg. Danm. no. 51. Harv. Man. p. 18. 



Cystoseira discors, Ag. Sp. Alg. vol. i. p. 62. Ag. Syst. p. 284. Spreng. 

 Syst. Veg. vol. iv. p. 317. /. Ag. Alg. Medit. p. 51. Endl. 3rd Suppl. 

 p. 30. Menegh. Alg. Ital. and Balm. vol. i. p. 83. Mont. Fl. Alger, p. 17. 

 KiUz. Phyc. Gen. p. 358. 



Cystoseira abrotanifolia, Ag. Sp.' Alg. vol. i. p. 63. Ag. Syst. p. 284. 

 Spreng. Syst. Veg. vol. iv. p. 317. J. Ag. Alg. Medit. p. 52. Endl. 3rd 

 Suppl. p. 30. Menegh. Alg. Ital. and Balm. vol. i. p. 92. Mont. Fl. Alger. 

 p. 19. Kiitz. Phyc. Gen. p. 357. 



Eucus fceniculaceus, Finn. Sp. PI. p. 1629. Turn. Hist. p. 252. 



Ficus discors, Linn. Syst. Nat. p. 717. Turn. Syn. p. 70. Fsper, Ic. t. 26. 

 Stack. Ner. Brit. t. 17. E. Bot. t. 2131. Lamour. Ess. p. 17. 



Fucus abrotanifolius, Linn. Sp. PI. p. 1629. Huds. Fl. Angl. p. 575. Stack. 

 Ner. Brit. p. 86. t. 14. Turn. Syn. p. 66. E. Bot. t. 2130. Lamour. 

 Ess.]). 18. 



Hab. Growing on rocks, in tide pools, near low -water mark. Perennial. 

 Summer. Southern shores of England, in several places. Sussex, Hud- 

 son. Sidmouth and Torquay, Mrs. Griffiths. Weymouth and Isle of 

 Wight, Stackhouse. Jersey, Miss White and Mix* Turner. 



Geogr.Distr. Atlantic shores of England, from the south of England to 

 Spain. Mediterranean Sea. 



Descr. Root a thick, hard, conical disc. Fronds one to two feet long-, much 

 branched. Stem four to six inches long, as thick as a goose quill, rough in 

 the upper part, with spine-like prominences. Branches numerous, lateral, 

 alternate, one to two feet long, filiform, rough with spinous processes, 

 especially below ; the older ones naked at base, pinnated above, with an 

 ovate outline. Pinna twice or thrice divided in a mixed alternate and 

 diehotomous manner, slender, containing small, elliptical air-vessels below 

 their 1'orkings. The branches of young plants, and occasionally of the 



