16 SYNOPSIS OF SEAWEED TRIBES. 



CHLOROSPERMME. 



THE GEASS GEEEN SEAWEEDS. 



-, C "Fronds filamentous, articulate . . , . Confervacex. 

 ^Eronds not articulate. 



^Fronds composed of one continuous cell, either filament- 

 i ous, simple, or densely interwoven together, or filiform 



2 < and branched Siphonacese. 



I Fronds flattened or tubular, consisting of many-sided 

 ^ cells cohering together Ukacese. 



GENERA OE THE SIPHON A CE.E TRIBE. 



Codium — Eilaments closely combined into a sponge-like frond. 

 Bryopsis — Eilaments free, pinnately branched. 

 Vaucheria — Eilaments free, irregularly branched. 



GENERA OE THE CONFERVA TRIBE. 



Cladophoea — Eilaments tufted, much branched. 

 Rhizoclonium— Eilaments decumbent, withroot-like branches. 

 Conferva — Eilaments unbranched. 



GENERA OE THE ULYA TRIBE. 



Enteromorpha — Erond tubular, simple or branched; green. 

 Ulva — Erond leafy ; green. 

 Porphyra — Erond leafy ; purple. 



