See. ]\IELANOSPERMEiE. ( 27 ) Fam. FUCACE^. 



Plate CXL. 

 FUCUS CANALICULATUS.— Zmw. 



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

 anastomosing filaments, the 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 (pvKos, " a sea-weed." 



Fucus canaUculafus. — Frond linear, deeply channeled on one side 

 repeatedly divided dichotomoiisly ; midrib and air-vessels none ; recep- 

 tacles terminal, binate or forked. 



Fucus canaUculatus. — Linn. Syst. Nat. vol. ii. p. 716; Fl. Dan. t. 214; Gmel. 

 Hist. p. 73, t. 1 A, f. 2 ; Lightf. Fl. Scot. p. 917 ; Velley, t. 1 ; With. 

 Br. PI. vol. iv. p. 99 ; Turn. Syn. p. 242 ; Turn. Hist. t. 3 ; Sm. E. 

 Bot. t. 823 ; Lamour. Ess. p. 20 ; Lynrjh. Hyd. Dan. p. 6, t. 1 ; Ag. 

 Sp. Alg. vol. i. p. 96 ; Ag. Syst. p. 279 ; Hook. Fl. Scot, part 2, 

 p. 96; Grev. Fl. Edin. p. 284; G^-ev. Alg. Brit. p. 18 ; Hook Br. 

 Fl. vol. ii. p. 268 ; Wyatt, Alg. Damn. No. 102 ; Kiltz. Phyc. Gen. 

 p. 352 ; Harv. in 3Iack. Fl. Hib. part 3, p. 169 ; Harv. P. B. 

 plate 229 ; Harv, Man. p. 20 ; Harv. Syn. p, 20 ; Atlas, plate 4, 

 fig. 15 ; /. G. Agardk, Sp. Gen. Alg. vol. i. p. 204. 



Fucus excisus.—Linn. Sp. PI. p. 1627 ; Mant. p. 508 ; Fl. Lapp. p. 366 ; Girnn. 

 Fl. Now. vol, i, p. 96. 



Pelvetia canaliculata. — Dne. An. Sc. Nat. 1845, p. 12. 



FucoDiuM canaliculatum. — /. Ag. Sp. Alg. vol. i. p. 204. 



Hab. — On rocky shores between high -water mark and half- tide level. Perennial. 

 Summer and autumn. 



Geogr. Dist. — Atlantic shores of Europe and North America. 



Description. — Root, a small conical disc. Fronds gregarious, tufted, 

 two to five inches or more in length, one to two lines in breadth, 

 repeatedly and regularly dichotomous, with occasional lateral innova- 

 tions, generally without distinct midrib, but with the margins much 

 thickened, and often so much incurved as to make the one side deeply 

 channeled ; the axils wide and rounded, the apices rather obtuse, bifid 

 or forked. Receptacles terminal, oblong, lanceolate, either in pairs or 

 deeply forked, tubercular ; spores oblong, ovate, and separating trans- 

 versely into two sporules. Substance very tough and leathery. Colour, 

 a pale yellowish olive. 



