180 THE MARINE BOTANIST. 



the margin, eventually the cilia become lengthened 

 nto various-shaped lobes, which are again ciliate at 

 their margins; the tubercles are placed on these 

 cilia, and the tetraspores are in cloudy spots over 

 the surface. Eoot creeping, composed of fibres. 

 Substance thick and rigid. This species requires to 

 be soaked for some little time in water before sub- 

 mitting to pressure, or the paper on which it is 

 preserved will be stained of a dark brown hue. 

 Colour a brownish red. Attached to rocks and 

 stones near low water mark, and at a greater depth. 

 Annual. Bears fruit in winter. 



RHODYMENIA JUB ATA.— JAGGED 

 RHODYMENIA. 



A variable plant very like the preceding, but 

 may be known from it by its brighter colour, softer 

 and more flaccid substance, also in the different 

 position of the tetraspores, which, in this, are con- 

 fined to the cilia. Sometimes the itonds are very 



