OsciUatoriecB.'] lyngbya. ' 333 



Hab. On rocks^ stones, corallines, and Algse, between 

 tide-marks. Perennial. Yery common. 



It is probable that many have observed it without sup- 

 posing that it was a plant. In some localities a person can 

 scarcely take up a handful of Corallina officinalis without 

 having on it more than one specimen of B. atra, like little 

 hemispherical masses of dark-green jelly. By the application 

 of a powerful lens it may be seen that these little green 

 pea-like masses are organic, and are made up of filaments 

 radiating from the centre. Each one, when greatly magni- 

 fied, is not unlike a handsome switch, the upper half of 

 which is nicely knotted. See Phyc. Brit., PL ccxxxix. 



Genus XCIX. LYNGBYA, Agardk, 



Gen. Char. Pilaments destitute of a mucous layer, free, flexible, 

 elongated, continuous, decumbent. Endochrome (green or 

 purple) densely annulated, and finely separating into lenticular 

 sporidia. — Name in honour of H. C. Lyngbye, author of an ex- 

 cellent work on the Algce of Denmark. — Harvey. 



1. Eyngeya CarmicHxVelii, Harvey. 

 Hab. On marine rocks, and on Fuel. Appin, Captain 

 Carmichael; Torba)^, Mrs. Wyatt; D. L., Saltcoats. 



It is very common here. As early as the month of April 



