41 HANDY BOOK OF 



character that wild sea- weed which is dispersed on most of 

 the Atlantic shores, from a high northern latitude to the 

 tropics, though as yet undiscovered in the Southern 

 ocean. 



CHAPTER VI. 



EHODOSPERMEiE. 



Marine plants of a rose-red, purple, or red-brown colour, 

 leafy, cylindrical, or filamentous. Fructification mostly 

 double, the primary contained in capsules, receptacles, or 

 immersed in the frond ; the secondary (when present) 

 minute granules, forming sori, scattered or defined patches, 

 or embedded in distinct receptacles. Seeds, red or red- 

 brown. — Harvey. 



Family VII.*— Ceramie^:. 



Ptilota PluMOSA. Communicated by a friend, from the coast of 

 Ayrshire. July 1849. 



