Ser. RHopoPSERME2. Fam. Ceramiea. 
Priate CCXIX. 
CERAMIUM DESLONGCHAMPII, Craw. 
_ Gen. Cuar. Frond filiform, one-tubed, articulated; the dissepiments 
; coated with a stratum of coloured cellules, which sometimes extend 
over the surface of the articulation. ructification of two kinds, on 
distinct individuals; 1, ¢e¢raspores, either immersed in the ramuli, or 
more or less external; 2, sessile, roundish receptacles (favella), 
having a pellucid limbus, containing minute, angular spores, and sub- 
tended by one or more short, involucral ramuli. Crramium (Roth.), 
—from xepapos, a pitcher, but the fruit is not pitcher-shaped. 
Ceramium Deslongchampii; filaments subsetaceous, attenuated upwards, 
rigid, irregularly dichotomous, with or without lateral ramuli; the 
apices straight, spreading ; articulations colourless, those of the main 
stems about thrice as long as broad, of the branches and ramuli much 
shorter; dissepiments opake, scarcely swollen; tetraspores whorled 
round the joints, prominent; favelle (?) heaped together, bursting 
irregularly from the sides of the branches, destitute of involucral 
ramuli. 
Czramium Deslongchampii, Chauvin, Alg. Norm. J. Ag. Advers. p. 26. 
Wyatt, Alg. Danm. no. 218. Hook. et Harv. in Lond. Journ, vol. vi. p. 410. 
Creramium Agardhianum, Griff. in Harv. Man. p. 99. 
Goneroceras Deslongchampil, Kitz. in Linn. 15. p. 135. Phyc. Gen. p. 379. 
t. 46. f. 1. 
Has. On rocks and stones between tide-marks, and on the smaller Alge. 
| Annual. Spring and summer. Generally distributed round the 
Bnitish coasts. Torquay, Mrs. Griffiths. Swansea, Mr. Ralfs. 
Mine Head, Somerset, Miss Gifford. Ardrossan, Rev. D. Lands- 
: borough. Frith of Forth, Dr. Greville. Belfast Bay, Mr. Templeton. 
Dublin Bay, Miss Ball. Very abundant at Balbriggan, &c., W.H.H. 
Geoer. Distr. Coast of France. Heligoland, Binder! Tasmania, Gunn. 
Descr. Root discoid, occasionally giving off short fibres. Fronds densely tufted, 
from two to four or five inches long, rather thicker than human hair, rigid and 
with a rough feel, slightly attenuated upwards, branched in a more or less 
regularly dichotomous order, the angles not very patent. Branches much 
divided, either naked throughout, or giving off, in greater or less abundance, 
short, simple, or forked, lateral ramuli. These ramuli are distributed in a 
very irregular manner; sometimes alternate, more frequently secund, and 
often very densely crowded, especially in the upper portion of the frond, 
which then becomes very bushy. Sometimes, as represented in fig. 2, the 
frond is very much distorted ; the branches spreading at right angles, and 
the ramuli variously curved and twisted. -dpices of the branches straight 
and spreading, subulate. Articulations pellucid, those of the lower part of 
the stem about thrice as long as broad, of the branches about equalling 
VOL. II. 2B 
