THE MARINE BOTANIST. 291 



branched plant than the preceding*, not uncommon 

 in many places from Orkney to Cornwall. Annual. 

 Summer. Grows on rocks or on the larger algae in 

 tide-pools in shaded situations. On the west of 

 Ireland, where, according to Dr. Harvey, it is most 

 abundant, and reaches a size much greater than 

 it attains on the Enghsh coast j it is often seen 

 in sheltered bays, growing in thick bunches of 

 extraordinary size and luxuriance on the broad- 

 leaved variety of Laminaria saccharina. '' These 

 are never exposed at low water, and can only 

 be reached in a boat ; but in shady channels and 

 pools between tide-marks, even at some distance 

 above the low water limit, specimens of nearly 

 equal size, attached to smaller algae, are frequently 

 met with." 



VAUCHERIA. 



Named in honour of M. Vaucher, a distinguished writer on 

 fresh water Confervae. 



Fronds aggregated, tubular, continuous, capillary, 



