THE MARINE BOTANIST. 43 



the surface of old plants^ the spores are fixed to 

 the outer stratum of cellular tissue by long 

 pedicels. At ebb-tide this plant may be observed 

 in great masses, the long- cord-like fronds floating* 

 just below the surface of the water. In land- 

 locked bays and harbours, such as Falmouth and 

 Milford, this plant luxuriates and often grows to 

 thirty or forty feet in length. The small variety 

 /3. tomentosa grows between tide-marks, and is 

 generally characterized by a more dense covering of 

 long olive or green-coloured hairs. By some authors 

 it is reckoned a distinct species, but Dr. Harvey 

 does not consider these characters sufficiently well- 

 marked to allow of its being separated from the 

 common form. Grows on rocks and stones in the 

 sea, above the level of low water-mark, and in 

 still water at the depth of ten or fifteen fathoms. 

 Annual. Summer. 



