68 SEA MOSSES. 



III. Frond narrow, compressed or flatiened. 

 Frond forked or branched, thick, tough, one 



to two feet long. " Rockweed." Fucics. P 



IV. Frond filiforivi or thread-like. 



I . Frond Unbranched. 

 Frond four to six inches long. Sometimes 

 inflated and constricted ; always covered 

 with minute dark dots. Color, yellow 

 olive. Asperococctts. 



Long, ten to twenty feet, elastic, much at- 

 tenuated at each end. Chofda. 

 2. Frond Branched, 

 (a.) Branches mostly simple. 

 Long in proportion to main stem, parts as large \ 



as pack-thread. Color black. C/wrdaria. 

 Short in proportion to main stem. Color, 

 olive or full green. Casiagnea. 



{b.) Branches, naked, divided and sub-divided. 

 Stem and branches repeatedly forking. Color, 

 yellowish olive, dotted over with minute 

 dark colored warts, frond six inches high. 



Stilophora. 

 Frond one to two feet long, intricately 

 branched; branches at last very small. 



Diciyosiphon. 



