IP * t c I s i a 213 



of the sea are submerged in the watery 

 ocean. 



The following genera of kelps are 

 known to occur in the Straits of 

 Fuca or in the immediate vicinity: 

 Chorda, Alaria y Agarum, Thalassio- 

 phyllum^ Laminaria, Hedophyllum, Pleu- 

 rophycus, Pterygophora, Eisenia, Cy ma- 

 there y Costaria, Lessonia y Postelsia, 

 Nereocystis, Dictyoneuron, Macrocystis 

 and Egregia. In this group all the 

 tribes of the family are represented, 

 and it includes forms from the simplest 

 and lowest to the most complex and 

 highly differentiated. It will be desir- 

 able to take up in order and briefly 

 characterize each generic type. 



Chorda, Here are included twine- 

 shaped kelps without distinction between 

 stipe and lamina. The lower part of 

 the frond is solid, the upper hollow. 

 The plant when growing resembles 



