RHODOPHYCE^], OR FLORIDE^E 



211 



constrictions, or rugose markings. There are no 

 foliar expansions, and the branching is dichotomous. 

 Gcdaxaura lapidescens forms hard stony tufts of dense 

 branches of almost as indurated a character as the 

 Corallines. 



The genus Chweocolax is one of the most remark- 





FIG 63. a, Chcetangium ornatum slightly reduced ; b, young carpogonial 

 branch of Scinaia furcellata liighly magnified, (b, after Schmitz.) 



able among Algae, since it contains at least one 

 species (though it certainly shows a remarkable 

 resemblance to Harvey dla) that is wholly parasitic, 

 viz., Ch. albus on Rhodomda sulfusca. It has no 

 chromatophores, and subsists entirely at the expense 

 of its host-plant, so far as is known a unique 



p 2 



