113 SEA AfOSSES. 



2. FronJi irrff^ularly branched, 

 (<j.) Frond leather)*, narrow, very dark reddish 

 brown ; branches in one pbnc, flat, 

 narrowed at lio-se an<l lop, bent sword- 

 sluj)e, and often lxjrdere<l with fine 

 spines; eight to twelve inches high. 



FarUnvia, 

 (^.) riants smaller and narrower, branching 

 much the same as the la-si , undary 

 branches, Iwrderetl with incurved spine- 

 like ramuli, much attenuated at both 

 enils. Color, very dark red. Pikea. 



3. Froti'i tvith UaJing stem, 

 Hran« hcs long, alternate ; secondary, short, 

 altenute ; ultimate ramuli, alternate, in- 

 cunxd, awl-shapcd, not constricted at 

 l>ase. Microcladia. 



III. Frond huform or cvusDRicAt- 



1. Frond ioarsf^ thick as fnick thread. 



(ij.) Frond divided by regular forkings, several 

 times repeated ; homy when dry, dark. 



Ahnffltia. 

 {b!) Frond with leading stem, branches short, 

 stout, ta|>ering at both ends. Clear red. 



Rhahdoma. 



