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LIST OF THE BEITISH 



1. Laurencia pinnatifida. 



2. „ ceespitosa (hybrida). 



3. „ obtusa. 



4. „ dasyphylla. 



5. ,, tenuissima. 



XLIV. Chrysimenia. 



Frond tubular, continuous, not constricted or jointed. 

 Fructification of two kinds. 



1. Chrysimenia clavellosa. 



2. „ Orcadensis. 



XLV. Chylocladia. 



Frond (at least, the branches) tubular, constricted at 

 regular intervals, and divided, by internal diaphragms, 

 into chambers. Fructification double, 



1. Chylocladia ovalis. 



2. „ kaliformis. 



3. „ reflexa. 



4. ,, parvula. 



5. „ articulata, 



