Ser. CHLOROSPERME%. Fam. Oscil/atoriee. 
Pruate CCCXI. 
LYNGBYA FERRUGINEA, “%. 
Grn. Coan. Filaments destitute of a mucous layer, free, flexible, elongated, 
decumbent, not oscillating. Zwbe continuous; endochrome green or 
purple, densely annulated, and finally separating into lenticular spo- 
ridia. Lynesya (4g.),—in honour of Hans Christian Lyngbye, author 
of an excellent work on the Algz of Denmark. 
Lynesya ferruginea ; filaments slender, flaccid, forming a long stratum of 
a verdegris-green colour, which gradually changes to a pale chestnut. 
Lynesya ferruginea, 4g. Syst. dig. p. 73. Harv. in Hook. Brit. Fl. vol. ii. 
p. 226. Harv. Man. ed. 2. p. 226. 
LynGBYa eruginosa, 4g. Syst. p. 74. Kg. Sp. Alg. p. 282. ; 
Lynepya subsalsa, Carm. MSS. 
ScytoneMA effusum, Carm. MS. (ante). 
Has. In small, mud-bottomed pools of brackish water, by the sea-side, 
filled at spring tides. Appin, Capt. Carmichael. 
Grocer. Distr. Similar situations in the North of Europe. 
Descr. Stratum “exceedingly thin and lax, extensive, at first of a vivid 
green colour, but passing gradually into a pale chestnut,” Carm. Filaments 
an inch long, flaccid, bent in various curves, but not twisted, of a pale 
verdegris-colour under the microscope. ndochrome filling the tube, evi- 
dently striate, the striz rather distant; 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 Oscillatoriee, than evidence of the rarity of this par- 
ticular species. How few of the collectors of seaweeds trouble 
themselves with the obscure vegetation of salt-water mud- 
bottomed pools near the shore :—yet such situations, when 
attentively examined, are found to be rich im microscopic 
forms, and in species of this curious family. I have no doubt 
