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P l a t e XLVIII.
BOSTRYCHIA SCORPIOIDES, Mont.
Gen. Chae. Frond dull purple, filiform, much branched, inarticulate,
d o tte d ; traversed by a jointed tu b e surrounded by one or more concentric
layers of oblong, coloured cells, wbicb are gradually shorter
towards the circumference ; tb e surface cells quadrate. Frnctification
of two kinds, on distinct individuals ; 1 , “ lateral capsules ” {ceramidia),
Roth. 2, tetraspores, contained in terminal, lanceolate pods.
B o s t e y c h i a {Mont.),—-from W'rrpvxos, a ringlet, or curl o f hair.
B o s t e y c h i a scorpioides; frond flexuous, subdichotomous; th e branches
three or four times p in n a te d ; pinn® and pimml® p a te n t; apices
strongly rolled t e a r d s .
B o s t e ic h ia sco rp io id es, Mont. Hist. Cuba, Bot. p . 39 ( 1 8 3 8 ) .
H e l io o t h a m n io n sco rp io id es, Kiitz. Phyc. Gen. p . 4 3 3 . t. 5 3 . v .
A l s id iu m scorpioides, J. Ag. in Linn. vol. x v . p . 2 8 . Endl. 3rd Suppl. p . 4 6 . -
E h o d om e l a sco rp io id es, Ag. Sp. Alg. vol. i. p . 3 8 0 . Ag. Syst. p . 2 0 0 . Grev.
Alg. Brit. p . 1 0 5 . LLooh. Br. El. vol. ii. p . 3 9 4 . Ilarv. in Mack. El. Hih.
p a r t 3. p . 1 9 7 . Harv. Man. p . 6 8 . Wyatt, Alg. Banm. n o . 6 9 .
F u cu s scorpioides, Gmelin, Hist. Fuc. p. 135.
F u cu s am p liib iu s, Huds. El. Ang. p . 5 9 0 . Stack. Ner. Brit. p . 8 6 . t. 1 4 .
E. Bot. 1 . 1 4 3 8 . Turn. Syn. vol. ii. p . 3 9 1 . Turn. Hist. t. 1 0 9 .
P lo c am ium am p h ib ium , Lamour. Ess. p . 5 0 .
H ab. On muddy sea shores, near high-water m a rk ; a t th e estuaries of
riv e rs ; in salt water ditches and marshes, adhering to th e roots of
flowermg-plants; also on submarine rocks within tid e m arks. Annual.
Summer. Selsey marshes, Martyn. N o rth Wales, Rev. II. Davies.
Shoreham, on Atriplex portulacoides, Mr. Borrer. Mouth of the
river Dart, Mrs. Oriffiths. Tydd marsh, Cambridgeshire, Mr. Shrim-
shire. Shore of Blackwater, near Maldon, Mr. E. Forster. Plymouth,
Barmouth, Pool near DolgeUy and at th e Menai bridge, Mr. Ralfs.
Port-Stewart, Ulster, Mr. D. Moore. Baldoyle, Mr. 3 1 ’ Calla and
Mr Bain. Eiver Shannon, a t Tarbert, Mr. W.
G e o g e . D i s t e . Atlantic shores of Europe, from England to Spain.
D e s c e . Eronds two to four inches high, rather thicker than hogs’ bristles, growing
in large, entangled tufts, filiform, flexuous, divided at frregular intervals
into a few main branches, wliich are either alternate or subdichotomous,
patent, and having their apices rolled into a spiral curl. These branches
are beset, at short intervals throughont their extent, with very patent or
reflexed, short branclilets, from a quarter to half an inch in length, and
much more slender than the main branches. Like the latter, then- apices
are more or less inrolled, and they are either pinnate or bi-tripinuate, with
gradually decreasing patent ramuli, of which the ultimate are subulate and
thorn-like. Under the microscope the frond appears to be beautifully
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