50 MARINE ALGAE 
green, or dark bluish-purple. The genus is very common, and 
the plants are often found on the bottoms of boats. 
Genus Lyngbya 
(Named for Hans Christian Lyngbye, a Danish botanist) 
L. majuscula, mermaid’s-hair. The filaments are curled or crisped, 
long, thick, and tenacious, matted together at the base, and blackish- 
green. The species grows in tufts on eel-grass and alge, and is often 
found floating free. It is common in summer everywhere south of Cape 
Cod and on the Pacific coast. 
L. ferruginea or estuarti. In this species the filaments are thin, 
soft, and without stability (flaccid), so that they lie flat like a thin 
stratum. They are verdigris-green in color, and are found in brackish 
pools and ditches and on muddy shores near the sea. 
