114 THE MARINE BOTANIST. 



POLYSIPHONIA FASTIGIATA.— TUFTED 

 POLYSIPHONIA. 



Filaments rigid, bristly, all nearly of the same 

 len^h; forming round tufts, repeatedly forked. 

 Grows abundantly on the fronds of Fucus nodosus, 

 and on the old stems of Fucus vesiculosus. Colour 

 brownish; black when dry. Substance rather 

 rigid. 



POLYSIPHONIA BYSSOIDES.— FEATHERY 

 POLYSIPHONIA. 



From four to twelve inches long, the main stem 

 undivided, and set throughout its length with 

 alternate or opposite branches, which are more or 

 less densely clothed with slender fibres which give a 

 peculiar soft and feathery appearance to this species, 

 and make it resemble a Dasya rather than a Poly- 

 siphonia. Substance generally soft and flaccid. 

 Colour a pinkish red, which soon exchanges to 



