300 BRITISH SEA-WEEDS. [^RJioclosjiermece. 



When growing on Laminaria the branchlets are often very 

 squarrose, and in this state it has been called P. jjcUens, 

 but it is only a variety. See ' Phycologia Britannica/ 



PI. CLXVII. 



21. POLYSIPHOXIA FORMOSA, SllJir. 



Hab. On rocks and Alga3. Annual. Summer. Pound 

 in England by !Mrs. Griffiths, Mrs. Wyatt, llev. W. S. 

 Hore, Dr. Cocks, Dr. Jacob, Eev. R. Cresswell ; in Ireland 

 by Mr. W. Thompson, Miss Ball, Mr. Moore, Mr. M'Calla ; 

 in Scotland, by Suhr, Orkney; Dr. Greville, Bute; Major 

 Martin, Ardrossan ; Miss M'Leish, Portincross. 



On the coast of Ayrshire it has chiefly been found growing 

 on Hal'ulrys sUiqnosa. It is a beautiful plant, much re- 

 sembling Poli/siphonia urceolata, but it is more graceful 

 and delicate, and its colour is more rosy. 



22. POLYSIPHONIA ELONGATA, GrevUk. 



Hab. In the sea, on stones, shells, and Algae. Biennial. 

 Spring and summer. 



Stems robust, cartilaginous; branches beset at the tips 

 with slender tufted ramuli, which are attenuated at the base. 

 It is very common and very variable. In its winter state 

 it is stout and rigid, destitute of ramuli, the branches 

 jointed like lobsters' horns. In early summer, when the 



