Sek. MELANOSPERMEiE. ( 3 ) Fam. FUCACE^. 



Plate CXXXI. 

 CYSTOSEIRA ERICOIDES.— ^^. 



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

 upwards ; air-vessels formed 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 kvcttis, "a box or bladder," and <reipa, "a 

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



Cystoseira ericoides. — Frond stout, rigid, aud woody in the older parts, 

 repeatedly and irregularly branched, and eveiywhere beset with short spine- 

 like processes ; air-vessels minute, solitary, immersed in the branches near 

 their apices ; receptacles " cylindrical, armed with awl-shaped processes." 



Cystoseira ericoides. — Ag. Sp. Alg. vol. i. p. 52; Ag. Syst. p. 281 ; Spreng. Syst. 

 Veg. vol. iv. p. 316; Grev. Alg. Brit. p. 4; Hook. Br. Fl. vol. ii. 

 p. 265; Endl 3rd Suppl. p. 30 ; /. G. Ag. Gen. et Sp. A Ig. vol. i. p. 221 ; 

 Harv. in Mach Fl. Eih. part 3, p. 167 ; Harv. P. B. plate 265 ; 

 Harv. Man. p. 16 ; Harv. Syn. p. 13 ; Atlas, plate 1, fig. 4. 



Halerica ericoides. — Kiitz. Phyc. p. 354. 



Fucus ericoides. — Linn. Sp. PI. p. 1631 ; Good. & Woodw. in Linn, Trans, vol. iii. 

 p. 130; E. Bot. t. 1968 ; Turn. Hist. t. 191. 



Fuctrs tamariscifolius. — Huds. Fl. Angl. p. 576 ; Stach. Ner. Brit, p. 44, t. 11 ; 

 Turn. Syn. Fuc. p. 88 (excl. syn. Gmel.) 



Fncus selaginoides. — Esper, Ic. Fuc. vol. i. p. 69, t. 31 (excl. syn. Gmel.) ; Good. 

 & Woodw. in Linn. Trans, vol. iii. p. 132 ; Turn. Syn. p. 85. 



Hab. — On rocks and stones near low-water ; also in tide-pools. Perennial. Summer 

 and autumn. Common on the southern shores of England. Yarmouth {Mr. Turner) ; 

 Ayrshire coast {Dr. Landshorough) ; Kintyre {Dr. Curdie) ; west of Ireland, common. 



Geoqr. Dist. — Atlantic shores of Europe ; north of Africa. 



Description. — Root, a large spreading disc, very slightly conical. 

 Stem mostly solitary, six to eight inches long, and nearly half an inch 

 in diameter, cylindrical, frequently rough and tubercled, branched 

 towards the summit with stout tapering branches, bearing numerous 

 bi-tripinnate branches, all the divisions of which are cylindrical, filiform, 

 and distichous. The whole frond from near the base is everywhere 

 beset with subulate spine-like processes, scattered, very erect, but not 

 imbricated, " each furnished with a gland-like pore at its back." Struc- 

 ture cellular, cells of the periphery minute, forming dichotomous 



