Ser. GONGYLOSPERME.E. ( 137 ) Fam. CEKAMIACE/E. 



Plate CXIV. 

 GEIFFITHSIA SECUNDIFLORA.— /. Ag. 



Gen. Char. — " Frond rose-red, filamentous; filaments jointed throughout, mostly dicho- 

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

 on distinct i)lauts : 1. Favellce, surrounded by an involucre ; 2. TetrasjDores, 

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

 known for her numerous and valuable discoveries among British Algae. 



Griffithsia secundiflora. — Fronds cyliudi'ical, much branched ; 

 branches irregular, mostly dichotomous, somewhat flabellate upwards, 

 idtimate ramuli cylindrical, very obtuse, frequently secund ; articulations 

 cylindrical, two to thi-ee or nearly four times as long as broad, scarcely 

 shorter upwards. 



GvnYFYmsik secundiflora. — J. A(j. in Linn. vol. xv, p. 89; Alg. Medit. p. 75; 

 Mont. Algier. p. 141 ; Endl. 3rd Suppl. p. 35 ; Harv. P. B. plate 185; 

 Harv. Man. p. 169; Harv. Syn. p. 140; Atlas, plate 54, fig. 246; 

 /. G. Agardh, Sp. Gen. Alg. vol. ii. p. 86. 



Griffithsia crassa. — Kiitz. Pkyc. Gen. p. 374. 



Griffithsia intermedia. — Lenorm. in Herh. 



Griffithsia corallina, j3. — Bonn. Hyd. loc. p. 96. 



Ceramium corallinum, var. magus. — Desmaz. Crypt. Fr. No. 1032. 



Ceramium Desmazieri. — Crouan MS. 



Hab. — On rocks and other Algsg, at exti-eme low-watermark. Annual? Bovisaud, 

 near Plymouth {Bev. W. S. Hove). 



Geogr. Dist. — Atlantic coasts of France and Spain ; Mediterranean Sea. 



Description. — Eoot, a mass of creeping fibres. Fronds filiform, cylin- 

 drical, much branched and tufted, fom- to eight inches in length, and 

 about one-sixth of a line in diameter ; branches more or less dichoto- 

 mous, frequently secund, all very erect and subflabellate upwards, all of 

 equal thickness throughout, even to the apices, which are rounded and 

 obtuse ; towards the base short root-like I'amidi are not unfrequent. 

 Articulations cylindrical, two to tlu'ee or three and a-half times longer 

 than broad, with very thick hyaline tubes ; the dissepiments wide and 

 hyaline, the ends of the articulations not rounded. Substance rather 

 firai, slightly gelatinous, and firmly adhering to the paper in diying. 

 Colom", a fine deep transparent crimson red, rapidly discharged in fresh 



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