Seb. MELANOSPEEMEiE. 



( 87 ) Fam. DICTYOTE^. 



Plate CLXI. 

 DICTYOSIPHON FJEmCVLACEJJS.—Grev. 



Gen. Char. — Frond cellular, inner cells oblong, disposed in longitudinal series ; outer 

 minute, quadrangular, filiform, cylindrical, tubular, capillaceo-multifid. Fructi- 

 fication : "solitary or aggregated naked spores scattered irregularly over the 

 surface." Name from Si'/ctuoj/, " a net, " and (ri'</>wj/, "a tube." 



DiCTYOSiPHON fmiiculaceiis. — Frond cylindrical, capillaceo-multifid ; 

 primary branches long, secondary short, scattered, very rarely opposite ; 

 spores scattered, partially immersed. 



DiCTYOSiPHON fceniculaceus. — Grev. Alg. Brit. p. 5Q, t. 8; Hooh. Br. Fl. vol. ii. 

 p. 279; Wyatt, Alg. Danm. No. 205; Kiitz. Sp. Alg. p. 485 ; Aresch. 

 Phyc. Scand. p. 147, t. 6, 7, 8 (in part) ; B. Bot. Suppl. t. 2746 ; 

 Earv. in Mack. Fl. Hib. part 3, p. 176; Harv. P. B. plate 326 ; 

 Harv. Man. p. 40 ; Harv. Syn. p. 35 ; Atlas, plate 10, fig. 40 ; Harv. 

 N. B. A. part 1, p. 114 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 82. 



SoTTOSiPHON fcenictdaceus. — Ag. Sp. Alg. vol. i. p. 164 ; Ag, Syst. p. 258 ; 

 Lyngh. Hyd. Dan. p. 63, t. 14, 



Fucus subtilis. — Turn. Hist. t. 234. 



CoNFEETA /cETizcittocea. — Huds. Fl. Angl. vol. ii. p. 594; Lightf. FL Scot. vol. ii. 

 p. 981. 



Conferva marina fceniculacea. — Dill. Hist. Muse. p. 16, t. 2, f. 8. 



Hab. — On rocks, stones, and parasitically on other Algse, generally in pools between 

 tide-marks. Annual. Spring and Summer. Common. 



Geoor. Dist. — Atlantic shores of Europe and North America ; Baltic Sea. 



Description. — Eoot, a minute naked disc. Frond ten to twenty 

 inches in length, capillaceous, much branched ; branches irregular, very 

 long and cylindrical, everywhere beset with short, scattered, simple, 

 or capillaceo-multifid ramuli ; all the divisions are erecto-patent, the 

 axils rather acute, the apices tapering to a fine point ; occasionally 

 they are opposite, but veiy rarely, and now and then two or thi'ee 

 together ; when young the frond is covered with short confervoid hairs. 

 Substance cellular, at first solid, the inner cells very lai'ge, oblong, 

 arranged in four longitudinal series, and surrounded by similar series 

 of somewhat smaller cells, becoming still smaller to the surface ; outer 

 series minute, subquadrate or polygonal, forming an opaque peripheiy. 

 Substance rather flaccid, generally adhering, but not very tenaciously, to 

 the paper. Colour, a brownish olive. Fructification : roundish elliptical 

 spores, partially immersed in the cells of the periphery, generally single 



