(17) 



floating, which shows an unmistakeable affinity to the normal type of 

 the species. There is no appearance of fructification, but the midrib 

 on some of the branches is quite distinct, and these branches are much 

 more stragghng than the upright form of the variety, the ordinary 

 habit of which is to grow in dense patches — so dense indeed, that the 

 stems and branches are quite erect, and some force is required to 

 separate them. 



The species was one of those considered best suited for the manufac- 

 ture of kelp. It is still very extensively employed along the sea coast as 

 a manure ; and on the shores of our northern counties and islands is 

 much used as food for cattle dm-ing the winter months. 



EXPLANATION OF PLATE CXXXVL 



Fig. 1. — Fucus vesiculosus, natural size. 

 2. — Lanceolate receptacles. 

 3. — Roundisli receptacles with vesicles. 

 4. — Section of receptacle. 

 6. — Section of conceptacle. 

 6. — Spores and paraphyses. All magnified. 



VOL. III. 



