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loose, irregular coils of heavy olive- 

 green cord. 



Alaria. The laminae are often very 

 long, up to fifty feet. They are pro- 

 vided with a strong midrib, and carry 

 on the stipe, right and left, tufts of 

 sporophylls. One variety at the Sea- 

 side Station is abundant upon reefs 

 just offshore, and another is found 

 intermingled with Postelsia, and grow- 

 ing as a surf plant. 



Agarum. The broad leaves of 

 Agarum are provided with a distinct 

 midrib, and are perforated with large 

 numbers of circular or elliptical holes. 



Thalassiophyllum. In the matter of 

 perforations the plants classified here 

 resemble Agarum, but there is no mid- 

 rib, and the leaf is somewhat one-sided 

 in appearance. 



Laminaria. The frond is broadly 

 leaf -like, without perforations, lateral 



