272 



The Plant World. 



therefore typical only of the region directly influenced by the 

 coastal conditions. 



The Submerged Beach, both on the Bay of Fundy and the 

 ocean side, is rocky and affords a suitable foothold for the 

 growth of laminarias and rockweeds. The Laminaria Forma- 

 tion is characteristic of this topographic situation, extending 

 from the lowest tide line to considerable depths. Two species 

 of laminaria were found washed ashore by stoim waves (L. 

 longicruris and L. digitata) and small specimens were observed 

 in situ in shallow water at low tide. Associated with the lamina- 

 ias are Desmarestia aculeata, Chorda filum, Cladophora sp., 



Fig. 1. — Cliff west side of Cape Fourchu at low tide, Fucus-Ascophyllum Formation. 



Cystoclonium purpurascens, Ahnfeldtia plicata, Euthora cris- 

 tata, Deleseria sinuosa, Chondrus crispus, and Polydes rotundua. 

 Close to the surface of the rocks to which the laminarias are at- 

 tached occur Leathesia difformis and Corralina officinalis. The 

 latter is said to be the commonest plant in the zone below twenty 

 meters. 



Within the rockbound harbors where wave action is reduced 

 to a minimum, where tidal inflow and ©utflow are the principal 

 aqueous movements, and the bottom is muddy the Zostera 

 Formation occurs. At low tide this has the appearance of a sub- 



