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P l a t e CCCVI.
CALOTHRIX HYDNOIDES, Carm.
G en. Ch a r . Filaments d e s titu te of a mu co u s layer, ere ct, tu fte d or ag g re g
a ted , fixed a t th e base, somewhat rig id , n o t o s cillating. Tube co n tin
u o u s ; endochrome gre en , densely an n u la ted , a t le n g th dissolved
in to le n tic u la r sporidia. Calothr ix {Ag.),— irom Kokos, beautiful,
an d 6pi^, a hair.
Calothrix hjdnoides; patches widely spreading, flattish, dark ohve-green;
filaments elongated, flexuous, c y l m d r i c a l , obtuse interwoven below,
their tips cohering in rigid, erect, tooth-hke bundles; border of the
filament wide, pellucid.
C a l o t h r ix hydnoides, Carm. in Book. Br. FI. vol. ii. p. 369. B a n . Man.
ed. 2. p. 225.
ScYTONEMA hydnoides, Carm. Alga Jppinenses, MSS. cum icone.
Symploca hydnoides, Kg. S p .filg . p. 272.
H a b . On the clayey sea-shorej near high-water mark. Appin, Cayjri Carmichael.
Near Queenstown, Cork Harbour, and various other
places, r . II. H . Sidmouth, Rev. R . Cresswell.
Geogr. D is t r . Channel coast of Prance. M. Lenormand.
D escb. Batches spreading over the mud. covering spaces one to t™» ”
or more inches in diameter, sometimes widely spreading, and commonly
circular, bristling all over with rigid, erect, close-set but
tooth-like bundles of filaments, resembling the teeth of a Bijdnum Filaments
composing the patch at first decumbent, spreading oyer the mud
from a common centre, and interwoven together m a thin stratum then
points curved upwards, and strongly glued together m tbe tootb-l ke
bundles — each filament with a wide, yeUowish, pellucid border and a daik
green endochrome, with subdistant, strongly-marked s ta e . Ih e f i ' ^ s are
what is called spuriously branched; that is. small filaments resembling
branches, adhere to the sides of longer ones, as shown m Tig. 4.
A well marked and easily recognized species, first noticed by
the late Capt. Carmichael on the muddy sea-shore near Appin.
He found it forming small patches an inch or two across,
bristling over with small points like the teeth of a Ilgdnum, and
this appears to be its usual habit when growing iiynud. When
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