26 THE MARINE BOTANIST. 



becoming' more and more slender and attenuated, 

 the whole plant having a strikingly feathery and 

 delicate appearance. The colour while growing is 

 a rich orange, tinted with brown ; but as in others 

 of the tribe, a few minutes' exposure to the air 

 suffices to turn it to a light verdigris green. Sub- 

 stance at first rigid, but soon becoming flaccid. 

 Grows on stones, and the larger algae between 

 tide-marks. Annual. Summer. Not uncommon 

 on the British shores. 



ARTHROCLADIA. 



Name meaning a joint and a branch, in allusion to the 

 nodose, or joint-like knots of the fronds. 



Frond fihform, cylindrical, minutely nodose, with 

 whorls of delicate, articulated filaments arising 

 from the knobs. Fructification, Jointed pods 

 springing from the filaments. 



