MARINE ALGiE. 



45 



Order TIL L AMTN ARI ACEiE . 



Olive-coloured, inarticulate sea-weeds, whose spores 

 are superficial, either forming cloud-like patches, or 

 covering the whole surface of the frond. 



XT. Alaria. 



Frond stipitate. Stipes ending in a midribbed leaf. 

 Root fibrous. 



1 . Alaria esculenta. 



XII. Lamina ria. 

 Frond stipitate. Stipes ending in a ribless leaf. 



1 . Laminaria digitata. 



2. ,, bulbosa. 



3. saccharina. 



4. „ Phyllitis. 



5. ,, fascia. 



XIII. Chorda. 



Frond leafless, cylindrical, hollow, the cavity inter- 

 rupted by transverse partitions. Hoot scutate. 



