214 CERAMIACE^. v. 



p. 685. Harv. Phyc. Brit, t. 181. Conferva rubra, E. Bot. t. 1166. Dlllw. Conf. 



t. 34. 



yS decurrens ; the younger internodes naked in the middle, the older gradually 

 covered over with cellules ; frond either regularly dichotomous or furnished with 

 lateral, forked ramuli. Ceramium decurrens, K'dtz. Sp. p. 675. Harv. Phyc. Brit. t. 276. 



7 proUferum ; internodes densely covered with cells ; frond dichotomous, beset on 

 all sides with numerous, lateral, simple or forked branchlets. Ceramium botryo- 

 carpum, Griff. — Harv. Phyc. Brit. t. 215. 



5 secundatum ; similar to var. 7, except that the ramuli are very generally 

 secund. Cer. secundatum, Lyngb. Hyd. Dan. t. 37, A. 



6 squarrosum ; frond of small size, regularly dicliotoraous, fastigiate, with very 

 few and short lateral ramuli ; lower forks distant, with patent axils ; upper very 

 close together, very patent, the segments divaricating and apices sometimes 

 revolute. 



Hab. Pacific Coast. Atlantic Coast from the Arctic Sea to Charleston, South 

 Carolina. j3, Prince Edward's Island, Dr. Jeans. Halifax, W. H. H. New Bed- 

 ford, Dr. Roche. 7, Newport, Prof. Bailey. S, Newfoundland, e, gro^\^ng on Zos- 

 tera, Boston Harbour, Mr. G. B. Emerson. Lynn, Mrs. Mudge. (v. v.) 



Frond two to ten inches long, thicker than hog's bristle below, attenuated up- 

 wards and capillary in the ultimate ramuli, pretty regularly dichotomous ; the 

 lower forks distant, the upper approximated, with rounded axils and erecto-patent 

 slightly converging segments. "Young specimens are generally simply dichotomous ; 

 older ones have often numerous lateral ramuli, half an inch in length, simple or 

 forked. Sometimes these are very numerous, as in vars. 7 and S. In var. ^, the 

 stem and branches are beautifully variegated with alternate pale and coloured 

 bands. In the other varieties the internodes ai'e uniformly coloured. Our var. e is 

 a very remarkable form, two to three inches high, fastigiate, with very patent 

 squarrose ramification. It almost looks like a distinct species, but seems traceable 

 through varying specimens into the common form. Colour, varying through nearly 

 every shade of red to orange, yellow, dirty white or greenish. 



Many more varieties than those above enumerated occur on our coasts. The 

 above are, however, the most distinctly marked. 



Skct. 2. DiAPHANA; Frond unarined {not spinuliferous); the stratum of cortical cdls 

 confined to a definitely limited band round the nodes ; the internodes diaphanous. 



3. Ceramium Hooperi ; fronds rising from creeping surculi, densely matted be- 

 low, erect, capillary, irregularly dichotomous ; ramuli scattered, erect, subulate, 

 straight, or slightly curved, (the ends of the branches frequently bearded at one 

 side with a series of thick, root-like fibres, one rising from every node) ; articula- 

 tions in all parts of the frond of equal length and breadth, the internode formed of 



