124 
CHORDAE! ACEiE. — Chordaeia. 
iy. 
filaments of the periphery club-shaped. J. Ag. Sp. Alg. vol. 1, p. 66. Kiitz. Sp. 
Alg. p. 54 6 . Harv. Phyc. Brit. t. 111. Fucus flagelliformis, Turn. Hist. t. 85. E. 
Bot. t. 1222. 
Hab. On rocks, stones, and the smaller Algse between tide-marks. Common on 
the shores of the Northern States. Newfoundland, Lenormand. Halifax, W.H.H. 
Newport, R. I., Prof. Bailey , Mr. Olney , &c. Boston, G. B. Emerson. Staten 
Island, N. Y. (v. v.) 
Fronds 1 — 2 feet long, as thick as bristle, mostly with an undivided leading stem, 
which is densely set throughout its whole length with crowded or fasciculate lateral 
branches. These branches are several inches long, of the same thickness as the 
stem, straight or nearly so, and usually unbranched and quite naked : sometimes 
they have each a few distant, spreading, straight ramuli ; and sometimes they 
are as densely beset as the stem with such ramuli. The substance is firmly 
cartilaginous and elastic, the surface lubricous, and if the plant be allowed to 
remain some hours in fresh water, a very considerable quantity of mucus and some 
colouring matter will be given off. The colour is always very dark olivaceous 
brown. In young specimens, the whole frond consists of the cellulo-fibrous axis, 
composed of a dense network of anastomosing threads ; there is then no periphery , 
or merely an outward coating of dark-coloured cells. As the plant enlarges, the 
surface-cells grow out, by repeated cell division, into moniliform peripheric threads, 
which form a complete covering or pile to the frond. These peripheric filaments are 
club-shaped, the cells of which they are composed gradually increasing in size, from 
the base to the apex of the filament. Spores , concealed among the threads of the 
periphery, are abundantly produced by almost every full-sized individual. When 
growing, the whole frond is clothed with fine, colourless, jointed hairs, which give 
the branches, as seen through the water, a feathery appearance. 
2. Chord aeia divaricata , Ag-. ; frond irregularly divided ; branches divaricating, 
subdichotomous, flexuous, furnished with scattered, short, very patent, mostly 
forked ramuli ; filaments of the periphery capitate. J. Ag. Sp. Alg. vol. 1, p. 65. 
Harv. Phyc. Brit. t. 17. Mesogloia divaricata, Kiitz. Sp. Alg. p. 545. (Tab. XI. A.) 
Hab. On the smaller Algte, etc., at and below low-water mark. Shores of Long 
Island Sound, Stonington, Prof. J. W. Bailey. Newport, R. I., Mr. S. T. Olney. 
Hr. Hurhee. Green Port, Long Island, Prof. J. W. Bailey and W. H. H. New 
Bedford, Mr. Congdon. (v. v.) 
Fronds tufted, one or two feet long or more, not a line in diameter, very much, 
but irregularly branched. Sometimes there is a leading stem, with lateral branches, 
and sometimes the frond is broken up from the base into many principal divisions. 
The branches are of various lengths, subsimple or repeatedly forked. They spread 
at wide angles, and their divisions are equally patent, the intermediate spaces being 
