[ 167 ] 



V. 



A LIST OF SYNONYMS OF IKISH ALGAE, WITH SOME 

 ADDITIONAL EECOEDS AND OBSEKVATIONS. 



By J. ADAMS, M.A. 



Read Fedjiuarv 28. Ordured for Publication March 2. Published June 8, 1910. 



CONTENTS. 





PAOE 

 167 



Additional Species, 



PAGE 

 . 206 



168 



A. Fresh-water Species, 



B. Marine Species, 



. 206 

 . 207 



168 



Corrections and Enata, 



. 209 



187 



Revised Census of Species, 



. 212 





Additional Bibliography, 



. 213 



Introduction, . , 



List of Synonyms, 



A. Fresh-water Species, 



B. Marine Species, 



Introduction. 



About two years ago I published a " Synopsis of Irish Algae," giving a 

 list of the species observed in this country during a period of rather more 

 than a hundred years. As the old name under which the species was 

 first mentioned is in many cases quite different from that in use at the 

 present time, a list of these names, with theu" modern eqviivalents, will 

 obviously be of much service to future investigators of the group. Such a 

 list is now available, the names of the genera and species in each group being 

 arranged in alphabetical order, and the fresh-water species being given in a 

 separate list from the marine species. 



Great difference of opinion prevails among botanists as to the actual 

 limits of a species. In the " Synopsis " I followed De Toni's " Sylloge 

 Algarum " for the most part ; but it is now more than twenty years since 

 the first volume of that work was published. In 1908 the third volume of 

 "West's " Monograph of the British Desniidiaceae " appeared; and as that 

 publication is likely to remain for a long time the standard work on the 

 Desmids of the British Isles, it seems advisable to follow the views expressed 

 therein on the limits of species and varieties. As several volumes, however, 

 have still to appear, Professor West, of Birmingham, has kindly revised for 

 me not only the Desmids, but the whole of the fresh-water species. As a 

 result, a considerable number of names which were considered as species by 

 De Toni, but which Professor West I'egards as only varieties, will disappear 

 from the list. Furthermore, in a list containing over two thousand names, 



R. I. A. PROC, VOL. XXVni., SEOT. B. [2 A] 



