54 



LIST OF THE BftTTISH 



Subclass II. 



RHODOSPERMEiE, or CE RAMI ALES. 



Order VII. RHODOMELACEiE. 



Red or purple, rarely brown-red, sea-weeds. Fructi- 

 fication of two kinds : — 1. Spores contained either in 

 external or immersed conceptacles, or densely aggre- 

 gated together, and dispersed in masses through the 

 substance of the frond ; % Spores (called tetraspores) 

 immersed in distorted ramuli, or contained in proper 

 reomftacles. 



XXXVI. Odonthalia. 



Frond plano-convex, distichous, alternately toothed 

 at the margin. Fructification twofold. 



L. Odonthalia dentata. 



XXXVII. Rhodomela. 



Frond filiform, much branched, and coated with mi- 

 nute irregular cells. Fructification twofold on distinct 

 plants. 



1. Rhodomela lycopodioides. 



2. ,, subfosca. 



