cS 
Ser. RHODOSPERME. Fam. Ceramice. 
Puate CCCX XXIV. 
CERAMIUM STRICTUM, Kitz. (sp. 
Gen. Cuan. Frond filiform, one-tubed, articulated ; the dissepiments 
coated with a stratum of coloured cellules, which sometimes extend 
over the surface of the articulation. Fructification of two kinds, on 
distinct individuals: 1, ¢etraspores, either immersed in the ramuli, or 
more or less protrudent; 2, sessile, roundish receptacles (favelle) 
having a pellucid limbus, containing minute, angular spores, and 
subtended by one or more short, involucral ramuli. CrRraMium 
(Roth),—from xepapos, a pitcher; but the fruit is zo¢ pitcher-shaped. 
Creramium ‘strictum ; frond capillary, nearly equal, membranaceous, irre- 
gularly dichotomous, the lower forkings distant, the upper closer, all 
the divisions erect and straight, with narrow, acute axils ; the apices 
straight or slightly hooked inwards; articulations colourless, those 
of the lower dichotomies from three to four times as long as broad, 
of the upper gradually shorter ; dissepiments (smooth or hairy) opake, 
purple; favelle near the tips of the branches, involucrate; tetra- 
spores erumpent, bursting from the dissepiments of the larger 
branches, quadrifarious. 
CERAMIUM strictum, Harv. Man. ed. 2. p. 164. 
GoneroceRras strictum, Kitz. in Linnea, 1842, p. 735. Phyc. Gen. p. 380. 
Sp. Alg. p. 678. 
Has. On mussel-shells, corallines, &c. ; in tide-pools, near low-water 
mark. Torquay, Mrs. Griffiths. Penzance, Mr. Ralfs. Plymouth, 
Mr. Boswarva and Dr. Cocks. . Jersey, Miss Turner. Dingle, Kerry, 
W.H.H. Roundstone, Mr. M*Calla. 
Grocer. Distr. German Ocean, Kitz. 
Descr. Filaments capillary, from two to four inches high, densely tufted, the 
bases of the tufts entangled, from the presence of irregular creeping fibres. 
Filaments of nearly equal diameter throughout, dichotomous, without 
principal stem, but sometimes furnished with a few lateral ramuli; the 
lower dichotomies distant, the upper closer; all the segments of the fila- 
ment straight and erect, the axils acute and narrow; the apices more or 
less fastigiate, generally sharply bifid, with the points incurved, but not 
strongly involute. Articulations of the middle and lower portions three to 
four times, of the upper twice as long as broad, and of the ultimate and 
penultimate forkings much shorter than their breadth. Dissepiments coated 
with dense, minute, purple cells, slightly swollen, either quite smooth, or 
(when young) clothed with copious, long, slender, flexible hairs. Favellz 
2B2 
