15 156 



Proceedings of the Royal Irish Academy. 



IV.— THE CHARACTER OF THE FLORA. 

 1. Notes on the Novelties and Additions. 



As already mentioned, the systematic list contains the names of 437 

 species and 36 varieties. The revised census, as recorded by Mr. Adams' 

 private annotated copy, gives the total number of species for Ireland as 464 ; 

 so that making allowances for 12-15 species which are now regarded as 

 synonyms or varieties, the Survey list is within fifteen species of that for the 

 whole of Ireland. 1 As a local list, it must therefore be regarded as very 

 complete, though amongst microscopic and sub-littoral species additions 

 doubtless could be made by careful and continuous searching. 



The list of additions to Ireland, which consists of ninety-two species and 

 eleven varieties, is given below. It will be noted that it includes eighteen 

 species and four varieties (marked t) new to the British Isles, of which the 

 following five are new to science : — Calothrix endophytica, Codium miicronatum 

 var. athtnticvm, var. no v., Ascoci/cIks Saccharinae, Fucus vesiculoms var. 

 muscoides var. nov., Ptilothmnnion lucifugum. 



Aphanocapsa pallida. 



Dennocarpa violacea. 



Pleurocapsa amethystina. 



Spirulina subsalsa rar* Oceania. 



Oscillaria margari tifera. 



0. Corallinae. 



0. laete-virens. 



0. sancta. 



Phormidium fragile. 

 fP. persicinum. 

 tP. subuliferum. 



Lyngbya Meneghiniana. 

 fL. confervoides. 



L. semiplena. 



L. lutea. 

 fSymploca dubia. 



Plectonema Nostocorum. 



P. JBattcrsii. 

 P. norvegicum. 

 Microcoleus chthonoplastcs. 

 M. tenerrimus. 

 Calothrix consociata. 

 fC. endophyticas/;. nov. 

 C. parasitica. 

 C aeruginea. 

 Brachytrichia Balani. 

 Microchaete grisea. 

 Codiolum gregarium. 

 C. Petrocelidis. 

 Protoderma marinum. 

 Ulvella fucicola. 

 Monostroma orbiculatum. 

 Capsosiphon aureolus. 

 Enteromorpha prolifera. 



1 Some further species would have had to be added if Batters' Catalogue had beeu exactly 

 followed ; but in the systematic section several reductions have been made. 

 • In this list signifies that the variety only is new to Ireland. 



