Sek. MELANOSPERME^. (23) Fam. FUCACE^. 



Plate CXXXIX. 



FUCUS NODOSUS.— Xe//u. 



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 fi-ora (^v/cos, "a sea-weed." 



Fucus nodosm. — Frond linear, compressed, without any distinct mid- 

 rib, subdichotomous, or irregularly pinnate ; branches very much attenu- 

 ated towards the base, with minute, distant, alternate teeth ; vesicles 

 large, innate, elliptical, scattei-ed over the frond ; receptacles stalked, 

 arising from the axils of the marginal teeth. 



Fucus nodosus. — Linn. Sp. PL p. 1628 ; Fl. Suec. p. 431 ; Fl. Lapp. p. 366 ; 

 L!c/htf. Fl. Scot. vol. ii. p. 918 ; Ends. Fl. Angl. p. 584 ; With. Br. 

 PI. vol. iv. p. 84 ; Stack. Ner. Brit. p. 35, t. 10 ; Fl. Dan. t. 146 ; 

 E. Boi. t. 570 ; Fsper, p. 25, t. 7, and p. 118, t, 60; Gmel. Hist. 

 t. 1b, f. 1 ; Turn. Syn. p. 252 ; Turn. Hist. t. 91 ; Lamour. Ess. 

 p. 19 ; Ag. Sp. Alg. vol. i. p. 85 ; Ag. Syst. p. 275 ; HooTc. Fl. Scot. 

 part 2, p. 94 ; Grev, Fl. Edin. p. 284 ; Spreng. Syst. Veg. vol. iv. 

 p. 316 ; Grev. Alg. Brit. p. 16; Hooh Br. Fl. vol. ii. p. 268; Wyatt, 

 Alg. Danm. No. 154 ; Endl. 3rd Suppl. p. 29 ; Ra^'v. in MacJc. Fl. 

 Hih. part 3, p. 169 ; Earv. P. B. plate 158 ; Earv. Man. p. 19 ; 

 Earv. Syn. p. 19; Atlas, plate 4, fig. 13; Earv. N. B. A. part 1, 

 p. 68 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 206. 



Halidrys nodosa. — Lyngi. Hyd. Ban. p. 37, t. 8. 



Phtsocaulon nodosiim. — Kiitz. Phyc. Gen. p. 352. 



OzoTHALLiA vulguris. — Bne. in An. So. Nat. 1845, p. 13. 



Hab. — On rocks and stones from high-water to half-tide level. Perennial. Spring and 

 winter. Very common. 



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



Description. — Root, a large, hard, spreading disc. Fronds much 

 tufted, three feet or more in length, and about half an inch in breadth, 

 compressed, and two-edged, without distinct midrib, several times 

 dichotomously branched ; branches very long, the margins marked by 

 very shallow obtuse seiTatures, from which arise numerous short lateral 

 branches, similar to the main branches, and very much attenuated to 

 the base, the apices slightly tapering to an obtuse point ; from the axils 



