330 BRITISH SEA-WEEDS. {ClilorosjpermecB. 



lavei'y as it is employed for culinary purposes when Torpliyra 

 cannot be procured, but it is not thought to be so good as 

 that. I learn from Mr. Fleming, Eector of the Academy 

 at Kirkcudbright, that botli Forphjra and Viva latissima 

 grow in the Dee there so far up the river that, according 

 to the tide, they are alternately inhabitants of sea-water 

 and fresh-water. 



2. Ulva Lactuca, Linnceus. 



Hab. On rocks, &c., in the sea. Annual. Spring and 

 summer. Pretty common. Devonshire ; Bute ; Ayrshire. 



It first it is saccate, but soon bursts and becomes cleft. 

 It is much tenderer than the former, of a lighter green, 

 and a little gelatinous, so that it adheres well to paper in 

 drying. Dr. Greville, in Alg. Brit., says, " It^ adheres so 

 closely to paper as to resemble a drawing, and the surface 

 shines as if varnished. When preserved in the herbarium, 

 it is infinitely more beautiful than Ulva latissima." This 

 is not according to our experience in the west; for in my 

 opinion U. latissima forms the handsomest specimen, being 

 of a richer, darker green, and more glossy than U. Lactuca, 

 adhering nearly as well when young and recent. See 

 ' Phycologia Britannica,' PI. ccxliti. 



3. Ulva Linza, Linncens. 



