18 THE MARINE BOTANIST. 



animated seeds, issuing forth with life-like activity, 

 swimming in varied intricate circles, exactly re- 

 rembling the movements of the smaller animalcules. 

 Colour dark olive-gTeen. Substance of the frond, 

 leathery. Very common on rocky coasts. 



FUCUS NODUSUS.— KNOTTED FUCUS. 

 ^^SEA WHISTLES." 



Fronds long*, narrow ; air-vessels large, swelling 

 up in the main stem and branches. Receptacles 

 stalked, lateral, springing from the marginal teeth 

 on each side the frond, and when ripe of a rich 

 yellowish orange colour. Substance very tough 

 and leathery. Colour olive-green. This species 

 grows from two to four or six feet in length -, the 

 breadth of the frond varies ft*om a quarter to half 

 an inch, or more. Perennial. Winter and Spring. 

 Grows in dense masses on rocks and large stones 

 between tide-marks. Very common. 



