Ser. CHLOROSPERMEX. Fam. Oscillatoriea. 
Puatse CCC. 
LYNGBYA? FLACCA, Zarv. 
Gen. Cuar. Filaments destitute of a mucous layer, free, flexible, elon- 
gated, decumbent, not oscillating. Zuse continuous; endochrome 
green or purple, densely annulated and finally separating into lenti- 
cular sporidia. Lynepya (4g.),—in honour of Hans Christian 
Lyngbye, author of an excellent work on the Algee of Denmark. 
Lynesya ? flacca ; filaments short, tufted, straight or gently curved, 
simple, or having a few slender, proliferous, subulate, root-like 
ramuli, articulated; articulations shorter than their diameter, the 
endochrome at length contracting into a small central sporidium. 
LynaBya ? flacea, Harv. in Phyc. Brit. list, vol. i. p. xv. Harv. Man. ed. 2. 
p- 227. 
Hormipium flaceum, Avitz. Phyc. Gen. p. 244. 
Hormorricuum flaccum, A7vitz. Sp. Alg. p. 381. 
ConFrerRva flacca, Dillw. t. 49. #. Bot. t. 1943. Harv. in Hook, Br. Fl. 
vol. i. p. 354. Harv. Man, ed.i. p. 131. 
Has. Parasitical on various small Algz in tide-pools; on the Muci, and 
growing also on floating timber. Annual. Summer. Not uncommon. 
Geoer. Distr. Atlantic shores of Europe. 
Descr. Filaments from half an inch to an inch and a half in length, forming 
wide patches on floating timber, or covering various alge with a silken 
beard, fixed at base, freely floating in the water; straight or gently 
curved, either quite simple or throwing out, here and there, a few slender, 
subulate, root-lke processes, which seem to be a viviparous growth of the 
sporidium contained within the tube. Articulations rather well defined, 
shorter than their diameter, with a wide border; the endochrome at first 
filling the cell, but soon contracted, and then forming a small lenticular 
sporidium in the centre of the transparent articulation. Colour a beautiful 
grass-green. Substance lubricous and soft, closely adhering to paper in 
drying. 
WPI PPL IPP PAI 
In the last edition of the Manual I have divided the genus 
Lyngbya to two sections, to the latter of which the species 
now described belongs, as well as LZ. Carmichaelii and L. spe- 
ciosa, which have already been figured in this work. A better 
course would probably have been to have adopted Kiitzing’s 
