Ser. RHopOsPERME. Fam. Ceramiea. 
Puate CLXXXV. 
GRIFFITHSIA SECUNDIFLORA, 7. 4%. 
Gen. Cuar. Frond rosy-red, filamentous; filaments jointed throughout, 
mostly dichotomous; ramuli single-tubed; dissepiments hyaline. 
Fructification of two kinds on distinct individuals; 1, ¢etraspores 
affixed to whorled involucral ramuli. 2, gelatinous receptacles ( favella) 
surrounded by an involucre, and containing a mass of mimute, angular 
spores. GrurriTHsta (4g.),—in honour of Mrs. Griffiths, the most 
distinguished of British Algologists. 
Grirritusta secundifiora; filaments ultra-setaceous, somewhat gelatinous 
but firm, irregularly dichotomous, the lesser divisions flabellate ; axils 
acute ; branchlets fastigiate, obtuse, not tapering to a point; articu- 
lations cylindrical, two to four. times as long as broad, with a very 
wide border ; “involucres on very short, lateral peduncles.” 
GRIFFITHSIA secundiflora, J. 4g. in Linn. vol. xv. p. 39. Alg. Medit. p. 75. 
Mont. Algier. p.141. Endl. 3rd Supp. p. 35. 
GRIFFITHSIA crassa, Kitz. Phyc. Gen. p. 374. 
GRIFFITHSIA intermedia, Lenorm. in Herd. 
GRIFFITHSIA corallina 8. Bonn. Hyd. loc. p. 96. 
CERAMIUM corallinum, var. majus, Desmaz. Crypt. Fr. no. 1032. 
CrramMium Desmazieri, Crouan, MS. 
Has. On rocks, at extreme low-water mark. Perennial? Discovered at 
Bovisand, near Plymouth, August, 1846, by the Rev. W. 8. Hore. 
Gzoer. Distr. Atlantic coasts of France and Spain. Mediterranean Sea. 
Descr. Filaments originating in branched, decumbent, matted fibres; tufted, 
four to eight inches high, thicker than hog’s bristle, not sensibly attenuated 
upwards, generally simple below for the space of one or two inches, after- 
wards repeatedly and more or less closely dichotomous, with somewhat 
of a fan-shaped outline; the lesser divisions not regularly forked but often 
alternately or secundly divided: all the divisions very erect, and the axils, 
especially the upper ones, narrow and acute. Lesser branches and ramuli 
not tapering upwards, and very blunt. Articulations with a very wide pel- 
lucid border and narrow endochrome, cylindrical or sometimes obscurely 
pyriform, the lowermost about four times, the upper about twice as long as 
broad. ructification not as yet seen on British specimens. Colour a fine, 
full crimson, quickly discharged, with rupture of the membrane and curving 
of the branches, in fresh water. Swdstance between gelatinous and mem- 
branaceous, firm, closely adhering to paper in drying. Short, horizontal, 
secund, root-like ramuli, often issue from the lower part of the branches. 
DRAPE 
This noble species, one of the finest of the section to which it be- 
longs, was added to the British Flora, in the year 1846, by the Rev. 
