Ser. RHODOSPERME®. Fam. Ceramiea. 
Pruate CCLXXXVII. 
GRIFFITHSIA SIMPLICIFILUM, ~%. 
Gen. Cuar. Frond rose-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 receptucles (fa- 
velle) surrounded by an involucre, and containing a mass of minute 
angular spores. GrurrirHsta (4y.) in honour of Mrs. Griffiths, the 
most distinguished of British Algologists. 
GrirFitusia simplicifilum; stems slender, irregularly branched, whorled 
with imbricated, straight, once-forked ramelli. 
GRIFFITHSIA simplicifilum, 49. Sp. A/g. vol. il. p. 134. Harv. in Hook. Journ. 
Bot. vol.i. p. 301.-pl.139. Harv. in Mack. Fl. Mid. part iii. p. 212. 
CERAMIUM simplicifilum, D.C. #7. Gall. Syn. p. 8. 
Hatvrvs simplicifilum, Kitz. Sp. Alg. p. 663. 
Has. On rocks, &c., near low water-mark, and at a greater depth. Annual. 
Very rare. On rocks near Black Castle, Wicklow, and among 
rejectamenta at Ardinairy Point, county Wicklow. W.H.H. Coast 
of Norfolk, Rev. W. 8. Hore. Jersey, Miss Turner. 
Geroaer. Distr. Atlantic shores of France. 
Descr. Root clothed with matted and tangled fibres. Stem from four to eight 
or ten inches long, slender, much and iregularly branched ; the branches 
erect, long, straight, virgate, closely whorled throughout with short ramelli. 
In some specimens the secondary branches are destitute of lateral branches ; 
in others they are more or less densely set with short rudimentary 
branches, which are sometimes naked below, and having whorled ramelli 
above, and sometimes clothed with ramelli throughout. Ramelli from one 
to three lines in length, slightly imbricated, several in a whorl ; straight, 
very erect, mostly forked near the base; rarely twice or thrice dichotomous. 
Articulations of the branches about thrice as long as broad; of the ramelli 
from eight to twelve times as long as broad, having a narrow band of colour 
with a wide hyaline border. ructification not known, but probably similar 
to that of G. equisetifolia. Colour a bright pinky-red, given out quickly 
on immersion in fresh water. , Substance membranaceous, adhering to paper, 
but not very strongly. 
PPLE enw 
The characters by which this plant is to be known from 
G. equisetifolia are, the more slender branches, the more distant 
and less frequently forked, and straighter ramuli, and the 
greater proportionate length of the articulations. Usually the 
