Ser. GONGYLOSPERME/E. (47) Fam. CinnTOXTarTACEJ;, 



Plate LXXXIV. 

 AHNFELDTIA PLICATA.— /. G. Arj. 



Gen. Char. — Frond cartilaginous oi- even horny, composed of two strata of cells; the 

 inner forming very slender, densely-packed longitudinal filaments, those near the 

 sui-face minute, forming vertical, very densely-packed moniliform filaments. Fruc- 

 tification "of two kinds, on distinct plants :" 1. " Favellidia, partially immersed 

 in the substance of the frond ;" 2. External tubercles or warts (nemathecia), 

 composed of extremely fine radiating filaments. 



Ahxfeldtia plicata. — Frond horny, filiform, cylindrical, very much 

 branched irregulai'ly between alternate and dichotomous ; branches long, 

 slender and wiry, patent or erecto-patent, often secund ; nemathecia 

 scattered over the surface of the branches. 



Ahnfeldtia plicata. — /. G. Agardh, Sp. Oen. Alg. vol. ii. p. .311 ; Harv. N. B. A. 

 part 2, p. 168. 



Gymnogongrus iMcatus. — Kiitz. Sp. Alg. p. 789; Ilarv. P. B. plate 288; Harv. 

 Man. p. 145; ffarv. Syn. p. 119; Atlas, plate 46, fig. 211. 



GiGAETiNA pUcafa. — Lamour. Ess. p. 48 ; Lyngh. Hyd. Dan. p. 42 ; Grev. Alg. 

 Brit. p. 150; Book. Br. Fl. vol. ii. p. 301; Wyatt, Alg. Danm. 

 No. 116; Harv. in Made. Fl. Bib. part 3, p. 201; Barv. Man. 1st 

 edit. p. 76. 



SPH.a!Rococcus plicatus. — Ag. Sp. Alg. vol. i. p. 313 ; Ag. Syst. p. 234. 



TrLOCAEPUs plicatus. — Kiitz. Phyc. Gen. p. 411. 



Fucus plicatus, — Buds. Fl. Angl. vol. ii. p. 589 ; Staclc. Ner. Brit. p. 23, t. 7; 

 Turn. Syn. Fuc. p. 323 ; Turn. Bist. t. 180; E. Bot. t. 1089 ; Fl. Ban. 

 t. 408. 



ScYTOSiPHON hippuroides. — Lyngb. Byd. Ban. p. 63, t. 14. 



Hab. — On rocks, stones, and old shells within tide-marks, and in deeper water. 

 Perennial. Common. 



Geogr. Dist. — Atlantic shores of Europe and America ; New Holland (R. Brown) ; 

 Southern Ocean, at Kerguelen's Land {1)7: Booker). 



Description. — Root, a minute horny disc. Fronds filiform, cylin- 

 drical, generally single, rarely tufted, excessively branched from the 

 base, of equal diameter throughout, four to ten inches long or more, 

 and about the thickness of a bristle ; branches mostly dichotomous, 

 frequently alternate, often secund, and occasionally fascicled, generally 

 very patent, or more rarely erecto-patent, very long, slender and wiry, 

 sometimes flexuous, the axils very patent, but not generally rounded. 



