Marine Algw of Berwick-on-Tweed. 227 



Chsetopteris. 



Claclostephus. 

 Fam ily — Ka lesiaceje . 



Ralfsia. 

 Family — Myrionemace.e. 



Myrionema. 

 Family — Chord ariace^e . 

 Tribe I. — Leatiiesie.e. 



Elachista. 



Leathesia. 

 Tribe II — Euchordarie/k. 



Ghordaria. 

 Tribe III. — Mesoglcee^e. 



Mesogloia. 



Castagnea. 

 Family — AsperococcauEjE . 



Asperococcus. 

 Family — LAMixARiACEiE. 



Chorda. 



Alaria. 



JSaccorkiza. 



Laminaria. 

 Family — Cutderiace.e . 



Aglaozonia. 



Order V.— FUCOIDEiE. 

 Family — Fucace^e . 



Halidrys. 



Fucus. 



Pelvetia. 



Ascophyllum. 



Himanthalia. 



Order VI.— DICTY0TE2E 



Dictyota. 



