Ser. MELAN0SPERME.'E. ( 15 ) Fam. FUCACEiE. 



Plate CXXXVL 

 FUCUS VESICULOSUS.— i/»;^ 



Gen. Char. — Frond coriaceous, internally composed of densely-packed, interlacing and 

 anastomosing filaments, tlie periphery of radiating filaments, short, simple, and 

 closely placed ; air - vessels innate ; receptacles terminal, or lateral and stalked, 

 containing within the periphery spherical receptacles communicating with the 

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

 spores or stalked antheridia, " or both." Name from ^u/cos, "a sea-weed." 



Fucus vesiciilosus. — Frond linear, flat, dichotomous, with a stout mid- 

 rib and entire margin; air-vessels elliptical, mostly in pairs, opposite, 

 often wanting ; receptacles much swollen, oblong or lanceolate, 



Fuc0S vesiculosus. — Linn. Sp. PI. p. 1626; Linn. Fl. Lap. p. 366; Huds. Fl. 

 Angl. p. 576 ; Liglitf. Fl. Scot. p. 904 ; Stack. Ner. Brit. p. 3, t. 2, 

 and p. 12, t. 6; Esper, Ic. Fuc. p. 35, t. 12, 13, and p. 160, t. 83, 84 ; 

 Velletj, t. 1 ; With. Br. Bot. vol. iv. p. S4 ; Omin. Fl. Norv. vol. i. 

 p. 48 ; Roth, Fl. Germ. vol. iii, p. 442 ; Turn. Syn. p. 117 ; Turn. 

 Hist. t. 88 ; Lamour. Ess. p. 18 ; E. Bot. t. 1066 ; Lyngb. Hyd. 

 Dan. p. 3, t. 1 ; Ag. Sp. Alg. vol. i. p. 87 ; Ag. Syst. p. 275 ; Grev. 

 Crypt. Fl. t. 319 ; Grev. Alg. Brit. p. 12, t. 2 ; Hook Br. Fl. vol. ii, 

 p. 267 ; Wyatt, Alg. Damn. No. 152 ; Kiitz. Phyc. Oen. p. 351, 

 t. 33-36 ; Endl. 3rd Suppl. p. 29 ; Mont. Fl. Canar. Cell. p. 139 ; 

 Mont. Fl. Alger, p. 21; Harv. in Maclc. Fl. Eib. part 3, p. 168 ; 

 Harv. in Bot. Beechey, pp. 163, 406 ; Barv. P. B. plate 204 ; Ilarr, 

 Man. p. 18 ; Harv. Syn. p. 17 ; Atlas, plate 3, fig. 10 ; Rarv. N. B. 

 A. part 1, p. 71 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 210. 



Fucus divaricatus. — Lijin. Sp. PI. p. 1627 ; Light/. Fl. Scot. p. 909 ; Esper, Ic. 

 t. 11. 



Fucus inflatus. — Linn. Sp. PI. p. 1627 ; LigUf. Fl. Scot. p. 910. 



Fucus spiralis.— Linn. Sp. PI. p. 1627 ; Stack. Ner. Brit. t. 5 ; E. Bot. t. 1685; 

 Fl. Dan. t. 286 ; Huds. Fl. Angl. p. 577 ; Light/. Fl. Scot. p. 911. 



Fucus volubilis. — Euds. Fl. Angl. p. 577. 



Fucus Sherardi. — Stack. Ner. Brit. p. 72, t. 13 ; J. Ag. Alg. Medit. p. 46. 



Fucus linearis. — Huds. Fl. Angl. p. 578. 



Fucus distichus. — Light/. Fl. Scot. p. 912 (not oi Linn.). 



Var. /3. subecostatus. — Small, tufted, with a midrid scarcely discernible — 

 rarely with vesicles. 



Fucus Balticus.—Ag. Sv. Bot. t. 516 ; Grev. Crypt. Fl. t. 181 ; Hai-v. P. B. 

 desc. plate 204 ; Harv. Man. p. 18. 



Hab. — On rocks and stones left exposed at low-water, and extending up rivers while 



