THE MARINE BOTANIST. 283 



ANALYSIS OF THE TRIBES. 



(Fronds filamentous, articulate 

 Confervacese. 

 Fronds not articulate 2 



Fronds composed of one continuous cell, 

 either filamentous, simple, or densely 

 interwoven together, or filiform and 

 branched. Siphonaceae, 



I Fronds flattened, or tubular, consisting" of 

 many-sided cells, cohering together. 



XJlvacese. 



Many of the species comprised in this division of 

 the algse are not marine plants, but inhabitants of 

 our fresh-water pools and ditches ^ others are found 

 in moist situations, on damp ground, rotten wood, 

 and among mosses. 



The remarkable voluntary action manifested by the 

 spores of the Confervese, and of other plants belong- 

 ing to this series, has excited much attention abroad, 



