THE MARINE BOTANIST. 25 



DESMARESTIA ACULEATA.— SPINY 

 DESMARESTIA. 



Fronds narrower than in the preceding* species^ 

 from one to three feet long. The branches when 

 young clothed with soft silky fibres^ which have 

 the appearance, at first sight, of a parasitical 

 conferva. When the plant has done growing, 

 these fibres fall off, and the branches bear short, 

 spine-like ramuh. Substance rather rigid, not 

 adhering to paper when old. Colour yellowish or 

 dark green. Grows on rocks, stones, or algae 

 between tide-marks ; also in four or five fathom 

 water. Perennial. Frequent on most shores. 



DESMARESTIA VIRIDIS. — GREEN DES- 

 MARESTIA. 



Fronds filiform; main frond from two to three 

 feet in leng-th, much branched in a pinnate manner ; 

 branches and ramuli exactly opposite, each series 



