Sek. MELANOSPERMEiE. ( 11 ) Fam. FUCACEiE. 



A 



-A 



Plate CXXXIV. ^^^. q, '' 



CYSTOSEIEA FIBROSA.— ^^. '( JLJ^' 



Gen. Char. — Frond very coriaceous, occasionally leafy at the base, slender and filiform 

 upwards ; air-vessels fonned by inflation of the frond ; receptacles terminal, very 

 small, containing numerous spherical conceptacles, communicating with the surface 

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

 mixed with antheridia. Name from kxxttis, "a box or bladder," and creipa, "a 

 chain," because the air-vessels are continuous through the branches. 



Ctstoseira fibrosa. — Stem compressed, much branched ; branches long, 

 slender, alternately bipinnate or trijDinnate ; pinnules densely set with 

 slender setaceous ramuli ; au'-vessels single or two together, immersed in 

 the branchlets ; receptacles very long, linear or linear-lanceolate, more or 

 less beset with setaceous ramuli. 



CrsTOSEiRA fibrosa. — Ag. S]}. Alg. vol. i. p. 65 ; Ag. Syst. p. 285 ; Sprcng. Syst. 

 Veg. vol. iv. p. 317; Grev. Alg. Brit. p. 8; Hook Br. Fl. vol. ii. 

 p. 266 ; Wyait, Alg. Barwi. No. 52 ; Encll. 3rd Suppl. p. 30 ; Fl. 

 Dan. t. 1902 ; Harv. in Mach Fl. Hib. part 3, p. 168 ; Harv. P. B 

 plate 133; Harv. Man. p. 17; Harv. Syn. p. 15; Atlas, plate 2, fig. 6 

 /, G. Agardh, Sp. Gen. Alg. vol. i. p. 226. 



Phyllacantha fibrosa. — Kiitz, Phye. Gen. p. 356. 



Fucrs fibrosus. — Huds. Fl. Angl. p. 575 ; Good. & Woodw. in Linn. Trans, vol. iii. 



p. 137 ; With. Br. PI. vol. iv. p. 87 ; Stach. Ner. Brit. p. 80, t. 14 ; 



Turn. Syn. vol. i. p. 93 ; Turn. Hist. t. 209 ; JS. Bot. t. 1969 ; Lamour 



Ess. p. 18. 



* 



Fucus abrotanoides. — G7nel. p. 89 ; Esper, Ic. p. 108, t. 54. 



FucTJS setaceus. — Huds. Fl. Angl. p. 575. 



Fucus 6acctt<MS. — Gmel. p. 90, t. 3, f. 2 ; Esper, Ic. p. 108, t. 54. 



Hab. — On rocks and in tide-pools near low- water mark ; also in deep water. Peren- 

 nial. Summer. Common on the southern shores of England, and on the north, south, 

 and west of Ireland. 



Geogk. Dist. — Atlantic shores of Europe. 



Description. — Root, a large, hard, expanded disc. Stem somewhat 

 compressed, six to eight inches or more in length, one to two lines in 

 thickness, nearly smooth, but furnished almost from the base with long, 

 slender, filiform branches, two to three times alternately and sometimes 

 irregularly pinnate ; all the divisions more or less naked in their lower 

 pax-t, but fm-nished with a few scattered straggling spines, which are 

 more numerous upwards, and on the ultimate pinnules are more 



