Ser. Melaxospermeje. Fam. Fucea. 



Plate LX. 



CYSTOSEIRA GRANULATA, 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. Recejrtacles terminal, small, cellular, 

 pierced by numerous pores, which communicate with immersed sphe- 

 rical conceptacles, containing parietal spores and tufted antheridia. 

 Cystoseira (Ag.) — from kvotis, a bladder, and o-eipd, a chain; because 

 the air vessels are generally arranged in strings. 



Cystoseira granulata ; stem cylindrical, covered with elliptical knobs, each 

 of which bears a slender, repeatedly divided, dichotomo-pinnate, fili- 

 form branch, irregularly set with scattered, awl-shaped, thorn-like 

 ramuli ; air vessels small, two or three together in the upper part of 

 the branches ; receptacles elongated. 



Cystoseira granulata, Ag. Sp. Alg. vol. i. p. 55. Syst. p. 232. Grev. Fl. Edin. 

 p. 285. Grev. Alg. Brit. p. 5. t. 2. Hook. Br. FL vol. ii. p. 265. Ilarv. 

 in Mack. Fl. Hib. part 3. p. 167. Wyatt, Alg. Damn. no. 101. Harv. Man. 

 p. 18. Endl.Srd Suppl. p. 30. 



Fucus granulans, Lin. Sp. PI. p. 1629. Fl. Ban. t. 591. Turn. Hist. t. 251. 

 E. Bot. t. 2169. Hook. Fl. Scot, part 2. p. 94. Lyngb. Hyd. Ban. p. 58. 



Fucus concatenate, Lin. Sp. PL p. 1629. Huds. Fl. sb/g. p. 574. Lightf. 

 FL Scot. vol. ii. p. 923. Clem. Ess. p. 310. Fellcy, PL Mar. t. 2. f. 1. 



Fucus mucronatus, Turn.Syn. vol. i. p. 78. 



Fucus nodicaulis, With. vol. iv. p. 111. 



Phyllacantiia Boryana (?), Kid:. Phyc. Gen. p. 355 (and probably several 

 other species of Phyllacantiia, Kiitz.). 



Hab. In rocky basins left by the tide, at and below half-tide level. Peren- 

 nial. Summer. Not uncommon on the shores of England and Ireland. 

 Aberfraw, Mr. Ralfs. Rare in Scotland? Jersey, Mks White. 



Geogr. Distr. Shores of Europe from Norway to Spain. 



Descr. Root a depressed, conical disc. Stem cylindrical, two to four lines in 

 diameter, and from two to ten inches in length, more or less densely covered 

 with quadrifarious, elliptical knobs, each of which produces a branch, severe] 

 inches to a foot or more in length. Branches filiform, slender, much divided 

 in a manner between diehotoinous and alternately pinnate; the smaller 

 branches twice or thrice compound. Air-vessels innate in the brandies, 

 often below an axil, or two or three together in the alternate branehlets, 

 elliptic-oblong. Axils obtuse. Hamuli scattered along the receptacles and 

 branches, small, spine-like, acute. Receptacles lanceolate, unequally tubercled. 

 Substance leathery, horny when dry. Colour a clear oli\e-grecn, in age 

 becoming brown or fox v. 



