Ser. MELANOSPERME.E. ( 19 ) Fam. FUCACE^. 



Plate CXXXVII. 

 FUCUS CERANOIDES.— iw;?. 



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 tlie 

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

 spores or stalked antheridia, "or both." Name from ^ukos, "a sea-weed." 



Fucus ceranoides. — Frond submembranaceous, semitrausparent, with a 

 narrow midrib, repeatedly dichotomoiis ; vesicles generally wanting ; 

 receptacles mostly borne on lateral dichotomous corymbs. 



Fucus ceranoides.— Linn. Sp. PL p. 1626 ; Fl. Lapp. p. 366 ; Stack. Ner. Brit. 

 p, 71, t. 13 ; Good. & Woodw. in Linn. Trans, vol. iii. p. 149 ; Turn. 

 Syn. Fuc. vol. i. p. 136 ; Twrn. Hist. t. 89 ; E. Bot. t. 2115 ; Lyngh. 

 Hyd. Dan. p. 5 ; Ag. Sp. Alg. vol. i. p. 93 ; Ag. Syst. p. 277; Grev. 

 Alg. Brit. p. 14; Hooh. Br. Fl. vol. ii. p. 267 ; Wyatt, Alg. Danm. 

 No. 154 ; J. G. Agardh, Sp. Gen. Alg. vol. i. p. 209 ; Kutz. Phye. Un. 

 p. 352 ; Sp. Alg. p. 590 ; Harv. in MacTc. Fl. Eib. part 3, p. 168 ; 

 Harv. P. B. plate 271; Harv. Man, p. 19; Harv. Syn. p. 17; Atlas, 

 plate 3, fig. 11 ; Harv. N. B. A. part 1, p. 70. 



Fucus distichus. — Esper, Ic. Fuc. vol. ii. p. 62, t. 139 (excl. syn.). 



Hab. — On rocks and stones between tide-marks ; often in bays and estuaries. Peren- 

 nial. Spring and summer. Common. 



Geogr. Dist. — Atlantic shores of Europe ; east coast of North America. 



Description. — Root, a flattened somewhat conical disc. Frond about 

 a foot in length or more, half an inch in breadth, repeatedly dichoto- 

 mous, the axils and apices broad and rounded, midrib slender, very 

 distinct and perciuTent. Fructification lateral, on repeatedly dichoto- 

 mous coiymbs, which are either alternate, opposite, or secund, with 

 very short branches ; receptacles small, tapering to the apices, binate or 

 forked. Substance thin, submembranaceous, and often much wrinkled 

 or corrugated on the siu-face, generally without air-vessels, but not 

 unfrequently the lateral margins of the frond are inflated from end to 

 end, or with occasional interruptions, and the whole frond is often much 

 spirally twisted. 



We still retain this species, with some misgivings as to the propriety 



