270 BRITISH SEA- WEEDS. \^Bhodosj]ermefX. 



3. Laurencia obtusa, Lamour. 



Hab. On the larger Algae. Annual. Summer and 

 autumn. 



This is common in England and Ireland. In Scotland^ 

 rather rare. It has been procured by Dr. Greville in Bute; 

 by Mr. W. Thompson at Ballantrae ; by Major ^lartin at 

 Ardrossan ; by D. L. at Portincross, Ayrshire, and in Arran 

 and Kintyre pretty abundantly. It is very commonly found 

 in rock-pools. AYlien exposed to the sun, it becomes a 

 dirty yellow ; but when young, or growing in deep water, 

 it is of a fine light-piidc colour. It is from three to six 

 inches in height. There is a beautiful characteristic figure 

 in Phyc. Brit., PI. cxlviii. 



4. Lal'Rencia dasyphylla, Lamour. 



Hab. On rocks and stones in the sea. Annual. Summer. 

 Frequent on the eastern and southern shores of England. 

 Pound in Ireland by Miss Hutchins, ]\Ir. W. Thompson, 

 Dr. Drummond ; in Scotland, by Mr. Brodie, Lossie- 

 mouth ; Dr. Greville, Bute ; Major Martin, Ardrossan ; in 

 Arran, by Dr. Greville and D. L. ; Miss White, Isle of 

 Portland. 



It is rarer in Scotland than the preceding, and it is a 

 larger and more handsome plant ; but its chief distinctions 

 are the transverse stria3 of the branches, and the tapering of 



