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XX. Defcrift'iQn ojUha pundlata. By John Slaclhoitfe, Efy, F.L. £ 



Read May 5, 1795. 



U L V A PUNCTATA. 



ULVA dichotoma, membranacea, diaphana ; fegmentis iatis^. 

 uniformibus, apicc furcatis ; fru6lificatione globofa, feflili, 

 in maculis oblongis per totam frondem glomeratim difpofita. 



Sp. nov. 



An inter Uhas vel Fucos annumeranda fit fpecies hsec, hand 

 equidem, ut opinor, fatis liquido conftat. Altltudo fexuncialis ; 

 latitudo fegmentorum vix uncialis : apices obtufi, furcati. Habitus 

 dichotomus. Subflantia frondis tenuiflima, pellucida. Fruftificatio 

 per totam frondem ordine bino, glomeratim difpofita : tubercula 

 fmgula, rotunda, glabra, femlia, atro-rubentia. From enervis, e 

 bafi tuberculata, fubtus plana, faxis adhaerenti exoritur. 



Hab. ad oppidum Weymouth in arena juxta portum. 



Dotted Viva, — Frond dichotomous, membranaceous, tranfparent; 

 the divifions wide, uniform, bluntly forked. Fructification in 

 patches; tubercles crowded, round, fmooth, without footftalks,, 

 dark-red colour* 



Qbfervationso, 



