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THE MARINE BOTANIST. 



ANALYSIS OF THE TRIBES. 



Sea-weeds of an olive-brown or blackish- 

 green colour. Fucacese. 



Sea-weeds of an olive-green or yellowish- 

 gTeen colour 



2 



3 



41 



I Fronds membranaceous, inarticulate 

 i Fronds articulate .... 



' Spores external borne on jointed filaments 



Sporochnaceae. 

 Spores on the surface of the fi^ond 

 ^Spores covering the whole of the frond, 

 or in ill-defined patches. 



Laminariaceae. 

 Spores grouped together in well-defined 



spots or lines. Dictyotacese. 



Fronds composed of articulate filaments 



interlaced together. Spores immersed. 



Chordariacese. 



Fronds filiform-jointed. Spores external. 



Ectocarpacese. 



