236 



XX. DefcrlptionofUlvapunSlata. By John Slaclhouje^ Efq. F. L. S\ 



Read May c^, T.'j<^$, 



U L Y A P U N C T A T A. 



ULVA ciichotoma, membranacea, diaphana ; fegmentis latis, 

 uniformibus, apice furcatis ; fru6lificatione globofa, leffili, 

 in maculis oblongis per totam frondcm glomeratim difpofita. 



Sp. nov. 



An inter Ulvas vel Fucos annumeranda fit fpecies hasc, hand 

 equidem, ut opiuor, fatis liquido conftat. Altitudo fexuncialis ; 

 latitudo fegmentorum vix uncialis : apices obtuu, turcati. Habitus 

 dichotomus. Subjlant'ia frondis tenuiffima, pellucida. FruSiificatio 

 per totara frondem ordine bino, glomeratim dilpofita : tubercula 

 fingula, rotunda, glabra, feflilia, atro-rubentia. From enervis, e 

 bafi tuberculata, fubtus plana, faxis adhxrenti exoritur. 



Hab. ad oppidum Weymouth in arena juxta portum. 



Dotted Viva. — Frond dichotomous, membranaceous, tranfparent: 

 the divifions wide, uniform, bluntly forked. Fruitification in 

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

 dark-red colour. 



Ohfervat'ions^ 



