Ser. MELANOSPERMEiE. ( 5 ) Fam. FUCACE^. 



Plate CXXXIL 

 CYSTOSEIEA GEANULATA.— ^^. 



Gen. Chak. — Frond very coriaceous, occasionally leafy at the 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 kvctis, "a box or bladder," and creipa, "a 

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



Cystosbira gramdata. — Stem scarcely divided j branches numerous, 

 long, slender, and " quadrifarious," very much swollen at the base, 

 repeatedly irregularly pinnate, or frequently dichotomous, beset, espe- 

 cially towards the summit, with spine-like ramuli ; air-vessels small, 

 contained in the branches, often forming an inflation below the axils. 



Ctstoseira granulata. — Ag. Si:>. Alg.\o\. i. p. 55; Ag. Syst. p. 282; Grev. Fl. 

 Edin. p. 285 ; Grev. Alg. Brit. p. 5, t. 2 ; Hooh. Br. Fl. vol. ii. p. 265 ; 

 Wyatt, Alg. Danm, No. 101 ; Endl. 3rd Suppl. p. 30 ; Harv. in MacJc. 

 Fl. Hib. part 3, p. 167 ; Harv. P. B. plate 60 ; Harv. Man. p. 16 ; 

 Earv. Syn. p. 13 ; Atlas, plate 2, fig. 5 ; J. G. Agardh, Sp, Gen. Alg. 

 vol. i. p. 217. 



Fucus granulatus. — Linn. Sp. PI. p. 1629 ; Fl. Dan. t. 591 ; Turn. Hist. t. 251 ; 

 E. Bot. t. 2169; Hook. Fl. Scot, part 2, p. 94; Lyngb. Hyd. Dan. 

 p. 58. 



Focus concatenatus. — Linn. Sp. PI. p. 1629 ; Huds. Fl. Angl. p. 574 ; Lightf. Fl. 

 Scot. vol. ii. p. 923 ; Clem. Ess. p. 310 ; Velley, PI. Man. t. 2, f. 1. 



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



Fucrs nodicaulis. — With. Br. PI. vol. iv. p. 111. 



Phtllacantha Boryana{l). — Kiitz. Phyc. Gen. p. 355 (and probably several other 

 species of Phyllacantha, Kutz.). 



Hab. —In rocky basins at and below half-tide level. Perennial. Summer. Common 

 on the shores of England and Ireland ; Jersey (Miss White). 



Geogr. Dist. — Shores of Europe ; from Norway to Spain. 



Description. — "Root, a depressed conical disc." Stem cylindrical, 

 simple, or once or twice divided, two to six inches or more in length, 

 and three to fom- lines in diameter, everywhere beset from the base with 

 long slender " quadrifarious " filiform branches, which are generally 

 alternately bipinnate or tripinnate, frequently dichotomous, scarcely 

 attenuated upwards, the branchlets of very irregular length and division, 



