Ser. RHopOSPERME. Fam. Rhodomelee. 
Pratr XLVIII. 
BOSTRYCHIA SCORPIOIDES, Mont. 
Gen. Cuar. Frond dull purple, filiform, much branched, inarticulate, 
dotted; traversed by a jomted tube surrounded by one or more con- 
centric layers of oblong, coloured cells, which are gradually shorter 
towards the circumference ; the surface cells quadrate. Lructification 
of two kinds, on distinct individuals; 1, “lateral capsules” (cera- 
midia), Roth. 2, tetraspores, contaimed in terminal, lanceolate pods. 
Bostrycuta (Mont.),—from Béorpixos, a ringlet, or curl of harr. 
Bosrrycuta scorpioides; frond flexuous, subdichotomous; the branches 
three or four times pimnated; pinne and pinnule patent; apices 
strongly rolled inwards. 
Bostricuia scorpioides, Mont. Hist. Cuba, Bot. p. 39 (1838). 
HELICOTHAMNION scorpioides, Avitz. Phyc. Gen. p. 433. t. 53. v. 
Atsrpr1um scorpioides, J. Ag. in Linn. vol. xv. p. 28. Endl. 3rd Suppl. p. 46. 
Ruopometa scorpioides, 4g. Sp. Aly. vol. i. p. 380. Ag. Syst. p. 200. Grev. 
Alg. Brit. p. 105. Hook. Br. Fl. vol. ii. p. 294. Harv. in Mack. Fl. Hib. 
part 3. p.197. Harv. Man. p.68. Wyatt, Alg. Danm. no. 69. 
Fucus scorpioides, Gmelin, Hist. Fuc. p. 135. 
Fucus amphibius, Huds. Fl. Ang. p. 590. Stack. Ner. Brit. p. 86. t. 14. 
E. Bot. t. 1428. Turn. Syn. vol. ii. p. 391. Turn, Hist. t. 109. 
ProcamivuM amphibium, Lamour. Ess. p. 50. 
Has. On muddy sea shores, near high-water mark; at the estuaries of 
rivers; in salt water ditches and marshes, adhering to the roots of 
flowermg-plants ; also on submarine rocks within tide marks. Annual. 
Summer. Selsey marshes, Martyn. North Wales, Rev. H. Davies. 
Shoreham, on Atriplex portulacoides, Mr. Borrer. Mouth of the 
river Dart, Mrs. Griffiths. Tydd marsh, Cambridgeshire, Mr. Shrim- 
shire. Shore of Blackwater, near Maldon, Mr. 2. Forster. Plymouth, 
Barmouth, Pool near Dolgelly and at the Menai bridge, Mr. Ralfs. 
Port- Stewart, Ulster, Mr. D. Moore. Baldoyle, Mr. W? Calla and 
Mr Bain. Riv er Shannon, at Tarbert, Mr. W. Andrews. 
Groer. Distr. Atlantic shores of Europe, from England to Spain. 
Descr. Fronds two to four inches high, rather thicker than hogs’ bristles, growing 
in large, entangled tufts, filiform, flexuous, divided at irregular intervals 
into a 1 few main branches, which are either alternate or subdichotomous, 
patent, and having their apices rolled into a spiral cwl. These branches 
are beset, at short | intervals throughont their extent, with very patent or 
reflexed, short branchlets, from a “quarter to half an inch in length, and 
much more slender than the main branches. Like the latter, their apices 
are more or less inrolled, and they are either pinnate or bi- -tripinnate, with 
gradually decreasing patent ramuli, of which the ultimate are subulate and 
thorn-like. Under the microscope the frond appears to be beautifully 
