New or critical Lithothamnia. 



By 

 1Æ. Foslie. 



(With 1 Plate.) 



Among an interesting collection of British Lithothamnia that 

 Mr. E. A. L. B atter s of Wormley had the kindness to send me 

 for comparison with the species found along the coast of Norway, 

 recorded in „The Norwegian Forms of Lithothamnion" 1 ) are some 

 specimens of an undescribed and characteristic species not met with 

 on the Norwegian coast, which here I want to describe. After a 

 part of the named paper was printed I also got some specimens 

 of different Lithothamnia from Mr. P. Hariot of Paris, gathered 

 on the coast of California, and one specimen from the straits of 

 Magellan. Three of these specimens constitute new species, that 

 I have at least not seen previously described, and together with 

 these I also want to record the other specimens belonging to for- 

 merly known species, as they are of interest with regard to the 

 apprehension and geographical distribution of this rather little known 

 group of algæ. 



Lithothamnion Battersii Fosl. mscr. 



L. fronde libera in fundo jacente, simplice vel subsimplice, 

 curvata vel flexuosa, 1.3—2 cm. longa, 2 — 3 mm. crassa, ramulis 



a ) Det kgl. norske Videnskabers Selskabs Skrifter 1894. Trondhjem 1895. 



1 



