Calithamnion.] ALG.E CONFERVOIDEiE. 341 



they do not precisely agree in all the above particulars, yet resemble the 

 Scottish specimens so nearly, that we aie afraid to describe them as 

 distinct. They are more slender in all parts, and the main-stems are 

 sub-articulate. C. Brodicci has much the habit of a small specimen of 

 C. tctragonum, but comes nearer in character to C Arbuscula. 



8. C. Hookeri, Ag. (Hookers Calithamnion) ; stem and 

 branches thick cartilaginous inarticulate laxly set with short 

 subovate plumules, pinna? flexuose patent subsimple very slen- 

 der acuminated, capsules subsolitary seated near the base of the 

 lowermost pinnse. — Ag. Sp. Alg. v. 2. p. 179? — Conferva 

 Hooker i, Dilho. Conf. t. 106. 



Sea-shore, very rare. Cawsie, Messrs. Hooker and Borrer. Holy- 

 head, Rev. H. Davies.— Dillwyn's figure is very characteristic. 



9 C. lanosum, Harv. (ivoolly Calithamnion); stem inarticu- 

 late slender, branches jointed excessively divided entangled 

 flexuose spreading, plumules crowded quadrifarious broadly ovate 

 obtuse, lower pinna? divaricated, upper spreading and sub-pinnu- 

 late, articulations of the branches 2 — 3 times longer than broad, 

 of the pinna? shorter, capsules subsolitary. 



Sea-shores. Tor Abbey, Mrs. Griffiths. Killinev, W. II. Harvey.— 

 ] — 3 inches high, flaccid, excessively branched, somewhat woolly and 

 entangled, branches very flexuose, closely plumulate, pinnae very patent 

 and divaricating. Main-stem nearly opaque, longitudinally striated. 

 Favellcc large, irregularly ovate, dark-red. In drying, this species fades 

 to a dull pink; wholly without gloss. On re-immersion, it is extremely 

 fragile and quickly gives out its colour. The habit is more that of C 

 roseum than of any species in this division, but its inarticulate stem give* 

 it a place here. 



2. Main-stems more or less distinctly articulate. 



* Plumules lax, ovate, lanceolate or irregular, subsimply pinnate, 



10. C. rdseum, Ag. (rosy Calithamnion); much and loosely 

 branched, plumules elliptic-oblong rounded crowded towards the 

 tops of the branches, pinna' long patent subsimple and flexuose, 



main articulations -1 — 5 times, of the pinna' -2 — 8 times, longer 



than broad, capsules elliptical scattered near the base of the 



phrase. — Ag. Sp. .\l</. r. -J. />. 1(>4. — Conferva rosea, 11. Hot. 

 t. 966, Dillw. Conf. t. 17 f — Ceramium roseum, Roth, Cat 

 lint. v. II. p. 182, and v. III. p. I !•">. 



Sea-shores, oo the larg< rhaps common ; buf bo rontinuallv 



confounded with other species, thai it La impossible to say how mam, or 

 the recorded stations belong to it. Our description ia drawn up from 

 Yarmouth specimens, communicated bj Dawson Turner, Esq., and com- 

 pared 1>\ him with the Ceramium roseum of Roth. — 2 — 4 inches high, 

 much branched from the base, excessively tufted, branches long and 

 flexuose, patent, distichous or quadrUarious, plumulate, plumules towards 

 the top crowded and fasciculate, I —6 lines Ions, tin- lower pinnules] 

 simple and flexw ere« to-j stent, the upper sparingly pinnu- 



tboul the B| " a fine purple-red .1/-"'' iud- 



