Ser. Melamospeeme*. Fam. Fucea. 



Plate CCXXIX. 



FUCUS CANALICULARS, Linn. 



Gen. Char. Frond linear, eitlier flat, compressed, or cylindrical, dichoto- 

 mous (rarely pinnated), coriaceous. Air-vessels, when present, innate, 

 simple. Receptacles eitlier terminal or lateral, filled with mucus 

 traversed by a net- work of jointed fibres, pierced by numerous pores, 

 which communicate with immersed, spherical conceptacles, containing 

 parietal spores or antheridia, or both. Fucus (X.), — from <\>vkos, a 

 sea -t 



Fucus canaliculatus ; frond linear, narrow, channelled on one side, without 

 mid-rib or air-vessels, dichotomous ; receptacles terminal, bipartite. 



Fucus canaliculatus, Linn. Syst. Nat. vol. ii. p. 716. Fl. Ban. t. 214. Gm. 

 Hist. p. 73. t. 1. A. f. 2. Light/. Fl. Scot. p. 917. Feller/, t. 1. With. 

 vol. iv. p. 99. Turn. Syn. p. 242. Turn. Hist. t. 3. Sm. F. Bot. t. 823. 

 Lamour. Ess. p. 20. Lyngb. Hyd. Dan. p. 6. t. 1. Ay. Sp. Alg. vol. i. 

 p. 96. Ag. Syst. p. 279. Hook. Fl. Scot, part 2. p. 96. Grev. Fl. Edin. 

 p. 284. Grev. Alg. Brit. p. 18. Hook. Br. Fl. vol.ii. p. 268. Harv. in 

 Mack. Fl. Hib. part 3, p. 169. Harv. Man. p. 21. Wyatt, Alg. Banm. 

 no. 102. Kutz. Phyc. Gen. p. 352. 



Fucus excisus, Linn. Sp. PL p. 1627. Mant. p. 508. Fl. Lapp. p. 366. 

 Gunn. Fl. Norv. vol. i. p. 96. 



Pelvetia canaliculata, Bne. An.Sc.Nat. 1845, p. 12. 



Fucodium canaliculatum, /. Ag. Sp. Alg. vol. i. p. 204. 



Hab. On rocky sea-shores, between high-water mark and half-tide level. 



Perennial. Summer and autumn. 

 Geogr. Distr. Atlantic shores of Europe and North America. 



Descr. Root, a conical expansion, half an inch or more in diameter. Frond* 

 densely tufted, from two to six inches or more in height, one to two or three 

 lines in breadth, nearly of equal breadth throughout, deeply channelled on 

 one side, and rounded on the other, many times dichotomous in a tolerably 

 regular manner ; the apices generally bifid. Receptacles terminating the 

 branches, narrow-cuneate, either deeply cloven or bipartite, swollen, tuber- 

 cular, containing numerous immersed conceptacles. Spores elliptical, at 

 length separating, by a transverse division, into two sporules. Substance 

 very tough and leathery. Structure dense. Colour, a clear olive when young, 

 becoming brownish or foxy in old age, the receptacles at length greenish- 

 vellow. 



This species begins to vegetate on the very edge of high-water 

 mark, often in places where it is only wet by the spray. In such 

 situations it attains a dwarfish size, seldom reaching more than an 

 inch or two in height, but the specimens sometimes arrive at 



