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LIST OF THE BKITISH 



LXXXIX. Bryopsis. 



Frond filiform, cylindrical, glistening, branched. 

 Branches pinnated, filled with a fine green, minutely 

 granuliferous fluid. 



1. Bryopsis plumosa. 



2. „ hypnoides. 



XC. Vaucheria. 



Frond aggregated, tubular, capillary, coloured by an 

 internal, green, pulverulent mass. Fructification dark- 

 green, homogeneous sporangia, attached to the frond. 



1. Vaucheria submarina. 



2. „ marina. 



3. „ velutina. 



Order XV. CONFERVACEiE. 



Green Algse, composed of articulated filaments, sim- 

 ple or branched. Cells cylindrical. 



