RAMBLES AND REVERIES. 



familiar species is the channelled Fncus (Fig. 1). 

 These with several others were once largely used in 

 the manufacture ,of kelp on account of their alkaline 

 constituents. F. 

 vesiculosus and F. 

 canaliculatus are 

 equally common at 

 most English sea-side 

 places (Figs. 1,2). The 

 celebrated Gulf-weed, 

 Sargassum bacci- 

 ferum, belongs to this 

 order of Fucacece. 



In the tide-pools 

 near low-water mark 

 occurs in many parts 

 of our coasts the 

 Desmarestia, whose 

 fronds are flat and 

 lance-shaped and pin- 

 nate, having spiny 

 teeth on their edges. 

 This may be taken as 

 typical of the Spor- 

 ochnacece or second 

 order of olive weeds. 



The most attractive of all the seaweeds with air- 

 bladders is the Sea-oak or Halidrys (Fig. 5). It is 

 found very generally on rocks and stones in the sea 

 at nearly low water mark. Usually the fronds are 

 about half a foot in length, though it is not un- 

 common to find them as long as three or four feet. 



FIG. 4. Fucv* nodosus. 



