;fi
T V r r
i l
P la t e CV. A.
OSCILLATORIA LITTORALIS, Carm.
G e n . C h a r . Filaments lying in a mucous matrix, rigid, simple, acicular,
vividly oscillating. Tube continuous ; endocrome green, densely annulated
with close, parallel, transverse striæ.—O s c i l la to r i a , ( VancL),
from the motion observed in the filaments, which resembles the oscillations
of a pendulum.
O s c i l l a to r i a littoralis, Carm. Stratum of a vividly æruginous green
colour ; filaments thick, dark green, variously curved ; striæ conspicuous,
close-set.
Harv.Oscillatoria littoralis, Carm. Alg. in Hook. Brit. M.
vol. ii. p. 375. Harv. Man. p. 165.
H a b . In pools, along the muddy sea shore, flooded by Spring tides.
Appin, Capt. Carmichael.
Descr. Stratum exceedingly thin, slimy, bullated by the extrication of air bubbles,
of a dark green colour, spreading to an indefinite extent over the muddy
bottom of the pool. Filaments 1 -3 lines long, much thicker than those of
0. nigra, straight or slightly curved, radiating very irregularly, and generaUy
in twisted bundles. Striæ strongly marked, at intervals of about one
third the diameter of the filament ” . Carm. I. c.
Of this I have only seen Capt. Carmichael’s specimens, from
one of which the figure is taken. I find the filaments curved
and twining together; the striæ very dense, and the mass of
endochrome divided at uncertain intervals into portions, which
probably break off eventually and become new filaments.
A . Fig. 1. Oscillatoria littoralis, part of a stratum
2. Filaments :— highly magnijied. -of-
P l a t e CV. B.
OSCILLATORIA SPIRALIS, Carm.
O s c i l l a to r i a spiralis; stratum membranaceous, or coriaceous, mruginous
or blackish-green; without much lubricity; filaments slender, spirally
twisted, densely interwoven, radiating in all directions.
Oscillatoria spiralis, Carm. Alg. Appin. ined. Harv. in Hook. Br. FI, vol. 3.
p. 377. Harv. Man. p. 167.
Oscillatoria subsalsa, Harv. I.e. p. 376. Harv. Man. p. 165.
Spirillum mpestre, Hass. Freshw. Alg. p. 277. t. 75. f. 6.
H a b . On rooks by the sea-side, above and between tide marks. zU Appin
by rocks where birds are in the habit of resting, Capt. Carmichael. i