Ser, CuLoRoseenMDa. Fam. Oscillatoriea. 
Piate CCCVI. ° 
CALOTHRIX HYDNOIDES, Carm. 
Gen. Cuar. Filaments destitute of a mucous layer, erect, tufted or aggre- 
gated, fixed at the base, somewhat rigid, not oscillating. 7use con- 
tinuous; endochrome green, densely annulated, at length dissolved 
into lenticular sporidia. Catorurix (4g.),—from xados, Jeautiful, 
and 6p, a hair. 
Catorurix hydnoides ; patches widely spreading, flattish, dark olive-green ; 
filaments elongated, flexuous, cylindrical, obtuse, interwoven below, 
their tips cohering in rigid, erect, tooth-like bundles; border of the 
filament wide, pellucid. ; 
CaLorurix hydnoides, Carm. in Hook. Br. Fl. vol. i. p. 369. Harv. Man. 
ed. 2. p. 225. 
Scytonema hydnoides, Carm. Alge Appinenses, MSS. cum icone. 
Sympioca hydnoides, Ky. Sp. dlg. p. 272. 
Has. On the clayey sea-shore, near high-water mark. Appin, Capt. Car- 
michael. Near Queenstown, Cork Harbour, and various other 
places, W.H. H. Sidmouth, Rev. R. Cresswell. 
Geroer. Distr. Channel coast of France, MW. Lenormand. 
Descr. Patches spreading over the mud, covering spaces one to two or three 
or more inches in diameter, sometimes widely spreading, and commonly 
circular, bristling all over with rigid, erect, close-set but not confounded, 
tooth-like bundles of filaments, resembling the teeth of a Hydnum.  Fila- 
ments composing the patch at first decumbent, spreading over the mud 
from a common centre, and interwoven together in a thin stratum, their 
points curved upwards, and strongly glued together in the tooth-like 
bundles ;—each filament with a wide, yellowish, pellucid border, anda dark 
green endochrome, with subdistant, strongly-marked strize. The filaments are 
what is called spuriously branched; that is, small filaments, resembling 
branches, adhere to the sides of longer ones, as shown in Fig. 4. 
RRR AR DRAA Annnnnnnnnnne 
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 mch or two across, 
bristling over with small points like the teeth of a Hyduwm, and 
this appears to be its usual habit when growing in mud. When 
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