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LYNGBYA FERRUGINEA, Ag.
G e n . Ch a r . Filaments destitute of a mucous layer, free, flexible, elongated,
decumbent, n o t oscillating. ' Tube continuous; endochrome green or
purple, densely annulated, and finally separating into lenticular sporidia.
L yngbya (Ag.),— in honour of Hans Christian Lyngbye, author
of an excellent work on th e Algse of Denmark.
I s m w x A ferruginea ; fllaments slender, flaccid, forming a long stratum of
a verdegris-green colour, which gradually changes to a pale chestnut.
L yngby.a ferrugìnea, Ag. Syst. Alg. p. 7 3 . Harv. in Hook. Brit. FI. vol. i i .
p. 3 3 6 . Harv. Man. ed. 3 , p. 3 3 6 .
L y n g b y a æ r u g i n o s a , Ag. Syst. p . 7 4 . Kg.Sp. Alg.'ÿ. 3 8 3 .
Lyngbya subsalsa, Carm. MSS.
ScYTONEMA effusum, Oarm. MS. (ante).
H a b . I n small, mud-bottomed pools of brackish water, by the sea-side,
filled a t spring tides. Appin, Capt. Carmichael.
Geogk. D is t e . Similar situations in the North of Em-ope.
D e sc e . Stratum “ exceedingly th in and lax, extensive, at first of a vivid
green colour, b u t passing gradually into a pale chestnut,” Carm. Filaments
an inch long, flaccid, bent in various curves, b u t not twisted, of a pale
verdegris-colour under th e microscope. Endoclirome filling the tube, evidently
striate, the striæ rather d is ta n t; border narrow. Colour of the
mass when dry a dull verdegris-green without gloss.
No one appears to have noticed this plant but the late
Captain Carmichael, a fact to be regarded more as a proof of
the comparatively little attention which has yet been paid
to the Oscillatorieoe, than evidence of the rarity of this particular
species. How few of the collectors of seaweeds trouble
themselves with the obscure vegetation of salt-water mud-
hottomed pools near the shore:—yet such situations, when
attentively examined, are found to be rich in microscopic
forms, and in species of this curious family. I have no doubt