221 



A List of the Marine Alyte of Berwick-on-Tweed\ By 

 Edward A. L. Batters, B.A., LL.B., F.L.S. 



Plates VIL, VIII, IX., X., XL 



Moke than thirty-live years have elapsed since the last oi' Dr. 

 Johnston's Lists of the Marine Algie of Berwick-on-Tweed 

 made its appearance. In the interval many species not pre- 

 viously recorded as occurring at Berwick have been added to 

 our Flora, and, owing to the great advances which have been 

 made in Algology, the nomenclature and classification used 

 have become nearly obsolete. A new List, incorporating all the 

 more recent records and changes in classification, may not, 

 therefore, be out of place. 



The number of papers which deal with the Alga) of Berwick 

 is not great. In 1807 Mr Thompson published his " Catalogue 

 of Plants growing in the Vicinity of Berwick-on-Tweed," but of 

 the species of Algse there enumerated only thirteen are Marine, 

 and "even those few cannot safely be admitted into any future 

 catalogue without re-examination."* In 1831 Dr G. Johnston 

 published in the second volume of his Flora of Berwick-ou-Tweed 

 the abridged descriptions of some 80 species of Marine Algao ; 

 and in 1853 in the " Natural History of the Eastern Borders," a 

 revised list in which he mentions, but without descriptions, 

 synonyms, or localities, about 90 species. A catalogue probably 

 by Mrs A. Gatty,f in which 16 species new to Berwick are 

 enumerated, and three short papers J by myself complete 

 the list of papers which deal directly with the Marine Flora 

 of Berwick. In Prof. Gr. Brady's lists § of Northumberland and 

 .Durham Algre, Mesogloia vermicular is, Desmarestia viridis, and 

 Lithothamnion calcarea (Sub • Melaleuca) are, so far as I am aware, 

 the only species to which habitats within our limits are affixed 

 which had not been recorded in any previous catalogue. In 



* Johnston Flora of Berwick, vol. u., p. 328. 



t Proceedings B.N.C., vol. ill., p. 200 (1854). 



X „ „ vol. x., pp. 108, 34!), and 535. 



§ Transactions Tyneside N.C., vol. iv. v. et seq. (1860 etc) 



