12 SYNOPSIS OF SEAWEED TRIBES. 



BHODOSPEEMEJS. 



THE EED SEAWEEDS. 



1 ( Frond with a calcareous coating . . . Corallinacex. 

 (Frond cellular or filiform, not encrusted. 



/"Frond (usually) filiform, and jointed either externally or 



2 } internally, or composed of articulated fibres, combined 



J _ together by gelatine. 



v. - 



Fronds continuous. 



C Spores contained in external urn-shaped receptacles (cere- 



3 < midici) Rhodomelacese. 



(.Spores not in ceremidia. 



/"Spores contained in naked berry -like receptacles, termed 



4 \ favellx Ceramiacese. 



J Spores immersed in the frond, or sub-external, 



V. Cryptonemiacese. 



* ( Tetraspores scattered. 



\ Tetraspores in defined spots .... Delesseriaceas. 



/"Tetraspores immersed in the branches and ramuli, 

 /» ) Laurenciacese. 



J Tetraspores either spread over the frond, or in cloud-like 

 V. spots Rhodymeniacex. 



GENERA OE THE RHODOMELA TRIBE. 



Odonthalia — Frond flat, serrated, with a faint mid-rib; 

 colour, very dark red. 



Rhodomela — Frond cylindrical, inarticulate, opaque. 



Eostrychia — Frond cylindrical, inarticulate, dotted. 



Rytiphlcea — Frond cylindrical, inarticulate, transversely 

 striate. 



Polystphonia — Fronds thread-like, articulate, longitudinally 

 striate. 



Dasya — Fronds cylindrical, with inarticulate stems and spread- 

 ing jointed ramuli. 



