Gloiocladia.'] dudhesnaia. 207 



honour of the brothers Crouan, of Brest, celebrated among 

 Trench Algologists. — Harvey. 



1. Crouania attenuata, •/. Agardh. 



Hab. Parasitical on the smaller Algse. On Cladostephus 

 spongiosus at Salcombe, Mrs. Wyatt ; near Penzance, Mr. 

 Ealfs. Annual. Summer. Yerj rare. See fine figures of it, 

 natural size and magnified, in Pliyc. Brit., PL cvi. 



Genus XLV. DUDRESNAIA, Bon7iem. 



Gen. Char. Frond cylindrical, gelatinous, elastic; axis com- 

 posed of lax net-work of anastomosing filaments, coated with a 

 stratum of closely-combined longitudinal fibres ; the periphery 

 of horizontal, dichotomous, moniliform filaments. Pructification 

 of two kinds, on diflFerent individuals : 1, globular masses of 

 spores (favellidia) attached to the filaments of the periphery ; 2, 

 external tetraspores borne on the filaments of the periphery, 

 generally terminating the ramuli. — The name is in honour of 

 M. Dudresnay. — Harvey. 



1. DuDEES^^AiA cocciNEA, Boniiem. 



Hab. Southern shores of England and Ireland. Very 

 rare. 



This is Mesogloia coccinea of Harvey^s Manual. We have 

 beautiful specimens of tliis rare plant from Rev. AY. S. Hore 



