iio 
NEW BRITISH MARINE ALGM. 
By E. M. Holmes, F.L.S. 
During the last three or four years I have, in conjunction with 
a few other algologists, attempted to extend the limits of the 
British Flora with respect to marine algae. The occurrence of 
Norwegian or Swedish species on the north-eastern coast of Great 
Britain seemed to me to be highly probable, inasmuch as the Fora- 
minifera of these coasts belong to similar species. It also appeared 
likely from the fact of northern species, e.g ., Odonthalia dentata , oc- 
curring on the Yorkshire Coast, that a cold current of sea-water from 
the north might convey Norwegian or. Baltic species to the east 
coast of Britain, at all events as far as the projecting county of 
Norfolk. On the other hand, a number of marine algse which 
occur on the coast of France should, in like manner, be found 
on the southern shores of Britain, and possibly as far north as 
Cumberland or wherever the warmth of the Gulf Stream is 
felt. Many southern species of Lichens, &c., are met with on 
the Welsh Coast and on the coast of Cumberland, and even further 
north, which must have been brought thither by this influence. 
With a view of stimulating further research in Britain for the 
species found on the Norwegian and French Coasts, the following 
list, which is the result of desultory observations during not more 
than four years, is now published : — 
Cryptophyce.®. 
* Codiolum gregarium, A. Braun. Alg. Unicell., p. 20, t. 1. 
Teignmouth, Rev. R. Cresswell, 1879. 
Dermocarpa Leibliniae, Bornet , Notes Algologiques n., pp. 75 and 76, 
t. 26, figs. 3-5. 
On Calothrix crastacea. Teignmouth, 1880, Rev. R. Cresswell. 
Detected also by the same observer on a specimen of Lyngbya majus- 
cula , in Miss Gifford’s Herbarium, collected in Jersey in Oct., 1874. 
* Dermocarpa prasina, Bornet, Notes Algologiques ll.,p. 7G, t. 26, figs. 6-9. 
On Catenella opuntia. Sidmouth, E. M. Holmes. Teignmouth, 
Rev. R. Cresswell. Firth of Forth, G. W. Traill. Cornwall, R. V. 
Tell am. 
This plant appears to have been mistaken by Turner for the fructi- 
fication of Catenella. Hist. Fucorum n., p. 96, t, 107, figs. c. and d. 
Lyngbya luteo-fusca, J. Ag. Alg. Medit., p. 11. 
Elie, Fifeshire, G. W. Traill, 1880. 
IVIicrocoleus lyngbyaceus, Thur., Bornet, Notes Algol. I., pi. 2, p. 5. 
Sidmouth, Rev. R. Cresswell, 1846. (Recently identified by 
Dr. Bornet, to whom the specimen was submitted.) 
Calothrix Crustacea, Thur ., Bornet, Notes Algologiques i., pi. 4, p. 13. 
Salcombe, near Teignmouth, Rev. R. Cresswell, 1880. 
Calothrix aeruginea, Thur. Bornet, Notes Algolog. U. , pi. 37, pp. 157, 158. 
On Ceramium rubrum-. Trevone Bay, near Padstow, R. Y. Tellam, 
1880. On Cladophora , Tor Abbey rocks, Rev. R. Cresswell, 1881. 
Isactis plana Thur., Bornet, Notes Algologiques, u.,p. 163, pZ. 40. 
On Punctaria latijolia. 
Ventnor, E. M. Holmes, 1880. Probably the plant described by 
Harvey, in his Manual of British Algte, 1st ed., p. 152. 
