2927. ƒ 2.
LYNGBYA ferruginea.
Rusty Lyngbya.
Gen. Char. Fruit terminal. Perianth none except
the convolute involucral leaves. Calyptra immersed
in the involucre.
Spec. Char. Filaments slender, flaccid, forming a
lax stratum of a verdigris-green colour, which
gradually changes to a pale chestnut.
Syn. Lyngbya ferruginea. Agardh Syst. Alg. 73.
Harv. in Hook. Eng. FI. v. 5. pt. 1. 370. Harv.
Man. 160.
Lyngbya subsalsa. Carm. MSS.
O n mud occasionally covered by the tide. Appin, Capt.
Carmichael; Sussex coast, W. Borrer, Esq.; Holyhead and
coast near Dolgelley, J. Ralfs, Esq., to whom we are indebted
for our specimens of this and the two preceding species.
Forming a loose thin stratum on mud. Threads an inch
or more long, flexuous, but not twisted, of a pale verdigris-
green which changes in the older portions to yellow-brown.
Rings apparently distant or approximate according to their
degree of development, at length bursting in masses from the
tubes which are left more or less empty.
Specimens received from M. Lenormand gathered at Caen
have far more slender threads than those of Mr. Ralfs, and
belong to a distinct species.—M. J. B.