Plate LXXVIII. 



Fig. 367. LYNGBYA FERRUGINEA. 



Colour. A dull verdigris-green, changing to rust-colour, but resuming the green, 



when dry. 

 Substance. Soft; woolly when dry. 



Character of Frond. Excessively slender threads {filaments) closely matted together; 

 forming 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; with 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-green. 

 Substance. Soft. 



Character of Frond. Very long, wavy, strongly curled, jointed threads {filaments) ; 

 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 {endoclirojne), which afterwards contracts into a dark spot in the centre. 

 Measurement. Almost indefinite. On Fucus vesiculosus, upwards of 1 foot. On 



rocks, covering 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, algae, floating timber, &c. ; between tide-marks and beyond. 



Now Hormotriclium Carmiclmilii. 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. 



3feasurement. Three or 4 inches long. 



Fructification. As in Z. Carmichcelii, but in F. speciosa the margins are often un- 

 even, from the gradual dropping out of the ^c?05;9 ore-masses (sporidia). 



Habitat. Appin. Torquay. St. Michael's Mount, &c. On rocks and algse between 

 tide-marks. 



Now Ilormotrichum speciosum. See under Fig. 328. The filaments are twice 

 as robust as those of L. CarmiclioGlii, and it adheres much more closely to paper 

 in drying. 



81 * M . 



