Ser. RooposPprrmMp”. Fam. Rhodomelec. 
Prats CXCV. 
POLYSIPHONIA BRODLAI, Grev. 
Gen. Cuar. Frond filamentous, partially or generally articulate; the 
joints longitudinally striate, composed of numerous radiating cells or 
tubes disposed round a central cavity. Mruetification two-fold on 
different individuals; 1, ovate capsules (ceramidia) furnished with a 
terminal pore, and containing a tuft of pear-shaped spores; 2, ¢era- 
spores imbedded in swollen branchlets. Potysirnonia (G@rev.),— 
from modus, many, and oper, a tube. 
Potystpnonta Brodiai; stems inarticulate, robust, cartilaginous, alter- 
nately branched; branches virgate, clothed with spreading, pencilled, 
multifid, delicate, flaccid ramuli ; articulations of the ramuli three or 
four tubed, rather longer than broad; siphons in the stem about 
seven, surrounding a narrow cavity; capsules ovate, pedicellate, or 
subsessile ; tetraspores in the swollen tips of the multifid ramuli. 
Porysrenonta Brodizi, Grev.—Harv. in Hook. Br. Fl. vol. ii. p. 328. Harv. 
in Mack. Fl. Hib. part 3. p. 206. Wyatt, Alg. Danm. no. 83. Hare. 
Man. p.91. Endl. 3rd Suppl. p. 45. Kiitz. Phyc. Gen. p. 427. 
Hurcuinsta Brodizi, Lyngh. Hyd. Dan. p. 109. t. 33. Hook. Fl. Scot. part 2. 
p- 88. Ag. Syst. p. 154. Ag. Sp. Alg. vol. ii. p. 63. 
Hurcuinsta penicillata, 4g. Sp. Alg. vol. ii. p. 65. 
Conrerva Brodiei, Dillw. Conf. t.107. F. Bot. t. 2589. 
Ceramium Brodiei, 4g. Disp. p. 20. 
Has. On rocks and corallines near low-water mark. Annual. Summer. 
Common on the rocky shores of Scotland; of the south of England, 
and south and west of Ireland. Channel Islands. 
Geoer. Distr. Atlantic shores of Europe, as far south as France ; and of North 
America. Feeroe Islands. 
Descr. Root a conical disc. Fronds from six to twelve inches long or more, as 
thick as small twine at the base, gradually attenuated upwards, generally 
furnished with a more or less evident main stem divided into several long, 
simple branches, of a linear-lanceolate outline. Sometimes the branches 
spring from nearly the same points; at other times they are disposed alter- 
nately along a lengthened stem, when the frond assumes a pinnate character. 
Branches long and simple, inarticulate like the stem, quadrifarious, and 
clothed more or less densely with short, flaccid, and slender quadrifarious 
ramuli, about half an inch in length. Ramuli multifid, irregularly dicho- 
tomous, pencilled, articulated. Articulations of the ramuli rather longer 
than broad, marked with three or four tubes; dissepiments hyaline. Stem 
opake, traversed by about seven primary siphons, surrounded by as many 
secondary ones, and with a wide stratum of smaller cells. Capsules ovate, 
abundantly produced on the multifid ramuli, mostly pedicellate. Tetraspores 
in swollen ramuli. Colowr a dark brown, with more or less of a purplish 
VOL. IT. it 
