Ser. GONGYT.OSrKRMEiE. ( 127 ) Fam. OERAMIACEiE. 



Plate CXII. 

 GPJFFITHSIA EQUISETIFOLIA.— ^f/. 



Gkn. CnAR. — '* Frond rose-red, filamentous; filaments jointed throughout, mostly dicho- 

 tomous ; ramuli single-tuhed ; dissepiments hyaline." Fructification of two kinds, 

 on distinct plants : 1. Favellte, surrounded by an involucre ; 2. Tetraspores, 

 attached to whorled "involucral ramuli." Name in honour of Mrs. Griffiths, well 

 known for her numerous and valuable discoveries among British Algse. 



Griffithsia equisetifolia. — Stems rather stout ; ramiili whorled, at 

 length closely imbricated, incurved, dichotomous, receptacles of the tetra- 

 spores stalked ; favelkie terminal on abbreviated ramuli. 



Griffithsia equisetifolia. — Ag. Syn. p. 28; Hook. Fl. Scot, part 2, p. 84; Ag. 

 Syst. p. 143; Grev. Fl. Edin. p. 312 ; Ag. Sp. Ahj. vol. ii. p. 133 ; 

 Hooh. Br. Fl. vol. ii. p. 337 ; Wyatt, Alg. Danm. No. 181 ; /. Ag. 

 Alg. Medit. p. 78 ; Endl. 3rd Suppl. p. 35 ; Harv. in Mack. Fl. Hih. 

 part 3, p. 211 ; Harv. P. B. plate 67 ; Harv. Man. p. 167 ; Harv. 

 Syn. p. 138 ; Atlas, plate 53, fig. 245. 



Halcrus equisetifolim. — Kiitz. Phyc. Gen. p. 374 ; /. G. Agardh, Sjp. Gen. Alg. 

 vol. ii. p. 90. 



Conferva equisetifolia. — Ligldf. Fl. Scot. p. 984; With. vol. iv. p. 133 ; I)illw. 

 Goaf. t. 54 ; E. Bot. t. 1479 ; Espcr, Fuc. Sup. t. 4. 



Conferva imbricata. — Huds. Fl. Angl. p. 603 ; Roth, Cat, vol. iii. p. 281. 



Conferva cancellata. — Soth, Cat. vol. ii. p. 230. 



Ceramium equisetifolium. — Be C. Syn. p. 8. 



Yar. simplinfilum. — Stems more slender ; ramuli straight, once divided. 



Harv. P. B. plate 287. 



Hab. — On rocks, at extreme low-water mark. Perennial. Summer. Common on the 

 southern and western shores of England and Ireland ; Wales ; rare in Scotland ; Frith of 

 Forth {Mr. Talden, Lightf.) ; Jersey {Misses White, Turner, and Edgar, Mr. F. P. 

 Girdlestone). 



Geogr. Dist. — Atlantic shores of Europe; Mediterranean Sea; Falkland Islands 

 {Agardh), 



Desceiption. — Root, a very small disc, at length densely covered like 

 the stem with woolly fibres. Fi'onds filiform, articulated throughout, 

 three to six or nine inches long, and about half a line in diameter, cylin- 

 drical, much branched ; branches irregular, very variable in length. 

 Articulations cylindrical, about twice as long as broad, furnished at 



