Bicti/otece.'] stilophoea. 143 



Hab. Near low-water mark on rocks and Algee. Annual. 

 Summer. Common in the south of England and in some 

 parts of Ireland. Got at Eothesay by the Eev. Gilbert 

 Laing, and dredged in Lamlash Bay by Major Martin; 

 obtained also in Jersey, and in the Baltic Sea and on the 

 Atlantic shores. 



This is Sjjorochms rJdzodes of Alg. Brit, and of Harvey^s 

 Manual. As it differs from the true Sjoorochni in fructifi- 

 cation, it has been made the type of a new genus. The 

 warted fructification is densely dispersed aver the whole 

 frond. Substance, when fresh, cartilaginous ; when kept, 

 soft and slimy. Colour yellowish-brown. 



2. StilophoRxI Lyngbyei, J. Agarclh. 



This is the var. /3 of British authors, which has now 

 been ranked as a distinct species. It is got abundantly in 

 dredging in Lamlash Bay, Arran. At times it is got with 

 the frond quite compressed, and about a line in breadth. 

 T^Hien newly dredged it is often crisp and rigid, and at 

 other times soft and slimy. 



Genus XX. DICTYOSIPHON, Greville, 

 Gen. Char. Erond filiform, tubular, contiimous, branched. 



