68 THE MARINE BOTANIST. 



GENERA OF THE CHORDARIA TRIBE. 



Chordaria, Frond^ the central part firmly gela- 

 tinous. 



Mesogloia, Frond, the centre of the frond loosely 

 gelatinous. 



Leathesia. Frond tuber-shaped. 



Ralfsia. Frond crustaceous. 



Elachista. Filaments pencilled rising from a 

 tubercular base. 



Myrionema. Filaments rising from a flat base. 

 Minute. 



CHORDARIA. 



Name from chorda a cord. 



Frond filiform, much branched, cartilaginous; the 

 central structure consists of densely packed longi- 

 tudinal filaments ; the outer portion of simple, club- 

 shaped whorled filaments, and gelatinous fibres. 

 jPructicatiofi spores placed among the outer fila- 

 ments. 



