W . l i . J l . i e l eb l i t K .
Rceve .B c n B im & Rcovc im j
i
P l a t e C L X X X V .
GRIFFITHSIA SECUNDIFLORA, / . Ag.
G en . Ch a r . Frond rosy-red, filamentous; filaments jointed throughout,
mostly dichotomous; ramuli single-tubed; dissepiments hyaline.
Fructification of two kinds on distinct individuals; 1, tetraspores
affixed to whorled involucral ramuli. 3, gelatinous receptacles [favellce)
surrounded by an involucre, and containing a mass of minute, angular
spores. G r ie e ith s ia [A g ),—^in honour of Mrs. Oriffiths, the most
distinguished of British Algologists.
G r i f f i t h s i a secundiflora-, filaments ultra-setaceous, somewhat gelatinous
but firm, irregularly dichotomous, the lesser divisions flabellate ; axils
acute ; branc ilets fastigiate, obtuse, not tapering to a point ; articulations
cylindrical, two to four times as long as broad, with a very
wide border; “ involucres on very short, lateral peduncles.”
G r i f f i t h s i a secundiflora, I . Ag. in Linn. vol. xv. p. 39. Alg. Medit. p. 75.
Mont. Algier. p. 141. Endl. 3rd Supp. p. 35,
Gr if f it h s ia crassa, Kiitz. Phyc. Gen. p. 374.
Gr if f it h s ia intermedia, Lenorm. in Eeri.
Gr if f it h s ia corallina /3. Bonn. Hyd. he. p. 96,
Ceramium corallinum, var. majus, Demnaz. Crypt. Fr. no. 1032.
Ceramium Desmazieri, Crouan, MS.
H a b . On rooks, at extreme low-water mark. Perennial? Discovered at
Bovisand, near Plymouth, August, 1846, by the Rev. W. 8. Hore.
Geo g r. D is t r . Atlantic coasts of France and Spain. Mediterranean Sea.
De sc r . 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, afterwards
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 : aU 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 pellucid
border and narrow endochrome, cylindrical or sometimes obscui'cly
pyriform, the lowermost about four times, the upper about twice as long as
broad. Fructification not as yet seen on British specimens. Colour a fine,
fuU crimson, quickly discharged, with ruptui-e of the membrane and curving
of the branches, in fresh water. Substance between gelatinous and membranaceous,
firm, closely adhering to paper in drying. Short, horizontal,
secund, root-like ramuli, often issue from the lower part of the branches.
This noble species, one of the finest of the section to which it belongs,
was added to the British Flora, in the year 1846, by the Rev.