Ser. MelanospermejE. Earn. Fucece. 



Plate CCLXXI. 



FUCUS CERANOIDES, Linn. 



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

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

 simple. Receptacles either terminal or lateral, rilled with mucus, 

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

 which communicate with immersed, spherical conceptacles, containing 

 parietal spores, or anther idia, or both. Eucus (L.), — from cjyvicos, a 

 sea-weed. 



Fucus ceranoides ; frond plane, coriaceo-membranaceous, linear, subdi- 

 chotomous, entire at the margin, midribbed, without vesicles ; lateral 

 branches narrower than the frond, repeatedly forked, level-topped, 

 bearing fruit in their apices ; receptacles spindle-shaped or bifid, 

 acute. 



Fucus ceranoides, Linn. Sp. PL p. 1626. II. Lapp. p. 366. Stack. Ner. Brit. 

 p. 71. t. 13. Good, and Woodw. Linn. Trans, vol. iii. p. 149. Turn. Syn. 

 Fuc. vol. i. p. 136. Turn. Hist. t. 89. Engl. Bot. t. 2115. Lyngb.lhjd. 

 Ban. p. 5. Ag. Sp. Alg. vol. i. p. 93. Ag. Syst. p. 277. Grev. Alg. Brit. 

 p. 14. Hook. Br. Fl. vol. ii. p. 267. Han. in Mack. Fl. Hib. part 3. p. 168. 

 Harv. Man. ed. 2. p. 19. Wyatt, Alg. Damn. no. 154. J. Ag. Gen. et Sp. 

 Alg. vol. i. p. 209. Kiitz. P/iyc. Un. p. 352. Sp. Alg. p. 590. 



Feces distichus, Esper, Lc.Fuc. vol. ii. p. 62. t. 139. {excl. syn.) 



Hab. On rocks and stones between tide-marks ; seldom, except in places 

 where fresh-water streams enter the sea ; often in land-locked bays, 

 and estuaries. Perennial. Spring and summer. Many places from 

 Orkney to Cornwall. 



Geogr. Distr. Atlantic shores of Europe, most frequent in the north. East 

 coast of North America. 



Descr. Root a conical disc. Frond from one to two feet in length, much di- 

 vided in a manner between pinnate and tlichotomous, the original branching 

 being dichotomous, and becoming more or less pinnated by the growth 

 of lateral branches ; consisting of a midribbed, linear, coriaceous, but 

 thin, membrane, perfectly entire at the edges and destitute of vesicles. 

 The main branches are from a quarter of an inch to half an inch or 

 more in breadth, and always about twice as broad as tin' lateral branches : 

 they are distantly and pretty regularly forked, with patent, obtuse or 

 emarginatc apices. The lateral branches are alternate, or sometimes 

 secund, springing from the sides of the main division; they are narrow, 

 closely and repeatedly forked, level-topped, and as it were corymbose. 

 Receptacles small, terminating the lateral branches, fusiform or doubly 

 fusiform and forked, swollen, gelatinous within, and acute or acuminate. 

 Substance much thinner and more transparent than in /*'. crsiadosus, but 

 nevertheless coriaceous. Colour a zreenish or brownish olive. 



VOL. III. 



