20 



THE MARINE BOTANIST. 



length ; one side of the stem is convex, the other 

 gTooved. Colour an olive-brown. Grows in thick 

 tufts, on the surface of rocks near high-water 

 mark. Perennial. Summer and Autumn. Very 

 common. 



HIMANTHALIA. 



Namej a translation of the English name, "sea-thongs." 



Frond top-shaped. Receptacles long, com- 

 pressed, repeatedly forked, springing from the 

 centre of the frond, pierced by pores. 



HIMANTHALIA LOREA.— SEA THONGS. 



Fronds round, small, fixed to the rocks by a 

 most tenacious gluten. The part called a re- 

 ceptacle in this plant is long, narrow, and regularly 

 forked ; the cup-shaped frond, according to Dr. 

 Harvey, is biennial, and takes a whole year to 

 arrive at perfection ; the strap-shaped receptacle 

 does not appear before the second year, when it 



