A Revised List of the British Marine Algae. 
BY 
E. M. HOLMES, F.L.S. 
AND 
E. A. L. BATTERS, B.A., LL.B., F.L.S. 
S INCE the publication of Harvey’s classical Phycologia 
Britannica, a very large number of species have been 
added to the British Marine Flora, and great progress has been 
made in the study of the modes of growth and reproduction 
of the various groups. Nevertheless, much still remains to be 
done before it will be possible to satisfactorily determine the 
systematic position, or even the right to specific rank, of many 
‘species.’ Consequently, any classification that may be 
adopted at the present time must be regarded, to a certain 
extent, as a provisional one. 
In preparing the following list it has been our object to 
bring it as nearly as possible into accordance with the most 
recent investigations, and to utilise, as far as possible, the 
terminology most generally accepted by algologists. An 
attempt has been made to give some degree of uniformity to 
the names adopted for the different groups, so that the nature 
of the group may be indicated by the terminal syllables of 
the name ; but the alterations thus made are, we believe, 
insufficient to cause any inconvenience. It has not seemed to 
us desirable to indicate at present the characters distinguishing 
the different groups, such details being reserved for a hand- 
book on the subject, which is already in progress, and which 
we hope to publish at a later date. Our aim has been rather 
[Annals of Botany, Vol. V. No. XVII. December 1890.] 
