KEY TO THE 

 GENERA OF THE ATLANTIC COAST. 



RED ALG^E. 



I. Frond membraneous. 



i. Frond Midribed. 



(a.) Plants small, with regular veins from 



midrib to margin of frond. Delesseria. 



(b.) Plants large, without veins, midrib slender. 



Frond thin, brilliant pink, more or less 



sprinkled with darker colored dots. 



Grinnellia. 

 2. Frond Stalked. 



Membrane small, short, forked, growing 

 on the apex of branching, cylindrical 

 stems. Fhyllophora. 



3. Frond plain, Membrane smooth, without 

 stalk, midrib, or vein. 

 (a.) Frond large, thirkish, mostly wedge or 

 fan shaped, palmately divided, some- 

 times strap-shaped. u Dulse." 



RJiodymenia. 

 (/>.) Frond thin, tapering to top and bottom, 

 bearing on the edges toothed frondlets 

 of the same shape. Callibhpharis. 



