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LIST OF THE BRITISH 



LXXIII. Catenella. 



Frond tubular, branched, constricted at intervals, dull 

 purple. Fructification of two kinds. 



1. Catenella Opuntia. 



LXXIV. Cruoria. 



Frond gelatinous, coriaceous, forming a skin on the 

 surface of rocks, composed of vertical, articulated fila- 

 ments. 



1. Cruoria pellita. 



LXXV. Naccaeia. 



Frond filiform, solid, rose-red. Ramuli composed of 

 jointed, dichotomous, whorled filaments. Fructification, 

 spores attached to the whorled filaments of the ramuli. 



1 . Naccaria Wigghii. 



LXXVI. Gloiosiphonia. 



Frond cylindrical, filiform, somewhat gelatinous, the 

 walls composed of radiating filaments. Fructification, 

 globules of red spores. 



1. Gloiosiphonia capillaris. - 



