Plate LXXVIII. 
Fig. 367. LYNGBYA FEREUGINEA. 
Colour. A dull verdigris-green, changing to rust-colour, but resuming the green, when dry. 
Substance. Soft ; woolly w^hen dry. 
Character of Frond. Excessively slender threads {filaments) closely matted together ; form- 
ing a layer at the bottom of mud-bottomed pools. Filaments bent in various curves, 
but not twisted ; unbranched ; tubular ; containing narrow, cylindrical colour-cells, 
which show through ; wuth tolerably clear division-lines. 
Measurement. Filaments from J to 1 inch high ; the larger spreading for several inches. 
Fructification. Minute seeds {zoospores) formed of the colour-cells in the filaments ; which 
cells then separate from each other, and at last drop out. 
Habitat. Appin, and elsewhere. Filey, on the rocks leading to the bridge. In small 
mud-bottomed pools near high-water mark. Not uncommon. 
Fig. 368. LYNGBYA CARMICH^LII. 
Colour. A bright grass-greeii. 
Substance. Soft. 
Character of Frond. Very long, wavy, strongly curled, jointed threads ; fixed at 
base, but forming extensive, closely-entangled, fleecy layers ; floating freely under 
water. 
Joints. Very short ; scarcely half as long as broad ; filled with dense green colouring matter 
{endochrome)j which afterwards contracts into a dark spot in the centre. 
Measurement. Almost indefinite. On Fucus vesiculosus, upwards of 1 foot. On rocks, cover- 
ing a space of 20 or 30 yards ! 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the joints, collected 
into a round central mass {sporidium)^ which in due time bursts out. 
Habitat. South and west coasts of England. West of Scotland. Ireland generally. On 
rocks, algas, floating timber, &c. ; between tide-marks and beyond. 
Now Hormotrichum Carmichcelii. See under Fig. 328. 
Fig. 369. LYNGBYA SPECIOSA. 
Colour. Bright yellow-green ; glossy when dry. 
Substance. Soft ; gelatinous. 
Character of Frond. Long ; thick ; first straight, then curled, jointed threads {filaments) ; 
unbranched ; fixed at base, but forming extensive, closely-entangled, fleecy layers ; 
floating freely under water. 
Joints. Very short ; scarcely half as long as broad ; filled with bright green colouring matter 
{endochrome)^ which afterwards contracts into a dark spot in the centre. 
Measurement. Three or 4 inches long. 
Fructification. As in L. Carmichaelii, but in L. speciosa the margins are often uneven, from 
the gradual dropping out of the .eoosj?ore-masses {sporidia). 
Habitat. Appin. Torquay. St. Michael’s Mount, &c. On rocks and algee between tide- 
marks. 
Now Hormotrichum speciosum. See under Fig. 328. The filaments are twice as robust 
as those of L. Carmich(Blii, and it adheres much more closely to paper in drying. 
155 
