CRYPTOGAMIA ALG^E. 221 



Hab. On rocks near high-water mark, in wide irregular 

 black patches. Very plentiful about the Needle-eye. 

 Aut. If. 



2. L. confinis, frond cylindrical, irregularly branched, 2 or 3 

 lines in height ; capsules oval, terminal. GREV. Crypt. Fl. t. 221. 

 A Iff. Brit. 23. Lichen confinis, Eng. Bot. t. 2575. 



Hab. On the black rocks at Bamborough, abundantly, Dr 

 Greviile. On the sandstone rocks of Hudshead, where 

 it can be moistened by the surf only at full tide. 

 Aut. 11 



124. FUCUS. 



* Frond with a midrib. 



1. F. vesiculosus, frond plane, dichotomous, generally with vesi- 

 cles placed in pairs ; margin entire ; receptacles mostly elliptical, 

 vellowish, terminating the segments LIGHTF. Scot. 904 WITH. 

 iv. 91. HOOK. Scot. ii. 94. GREV. Fl. Edin. 283 ; Crypt. FL 

 t. 319 ; Alg. Brit. 12. NEILL in Edin. Encycl. x. 18. 



Hab. Coasts of Berwickshire and N. Durham, very com- 

 mon. Spring. 11 



This species covers the rocks of our shores, and it also grows 

 plentifully at the margins of the river for the space of a 

 mile and a half from the mouth. The river plants, how- 

 ever, are thinner, darker coloured, and less loaded with 

 vesicles than the marine, and the ends of the branches, in 

 the spring season, are much enlarged and swollen with air. 

 In this state they are identical with the F. inflatus of some 

 botanists. LIGHT. Scot. 910. When the frond, as often 

 happens, is altogether destitute of bladders, and has be- 

 come twisted by the action of the waves, it is sometimes 

 called F. spiralis, WITH. iv. 100. 



It is the sea-ware most highly prized for the manufacture of 

 kelp, a valuable source ' of revenue to the proprietors of 

 the rocky shores of Europe, particularly of Britain, and 

 more especially of the northern and western islands of 

 Scotland. Formerly a small quantity of kelp was made 

 near Berwick and other villages on this coast, but the 

 practice has been discontinued for some years. In the 

 Scottish islands this fucus forms a considerable part of the 

 winter food of horses, cattle and sheep, which seem in- 



