r 11 ] 



II 



A SYNOPSIS OF lEISH ALG^, FEESHWATEE AND MAEINE. 



By J. ADAMS, m.a. 



Eead May 11. Ordered for Publication May 13. Published July 25, 1908. 





CONTENTS. 









Page 







Page 



Historical Introduction, . 



. 11 



Freshwater Species — continued: — 





Suitability of the Climate, 



. 13 



VII. Rhodophycese, 





36 



Provincial Distribution, . 



. 13 



Summary of Distribution, 



37 



Explanatory Eeruarljs, . . . 



. 14 



General Remarks on 



Distribution , 



37 



Doubtful Species, .... 



. 14 



Marine Species : — 







Freshwater Species : — 





I. Peridiniese, . 





38 



I. FlagellatEe, 



. 15 



II. Diatomaceae, 





38 



II. Peridinieae, 



. 15 



III. Cyanophyeese, 





44 



III. Diatomacese, 



. 15 



IV. Chlorophycese, 





45 



IV. Cyanophycese, 



. 20 



V. Phagophycese, 





46 



V. Conjugatse, 





VI. Ehodophycese, 





49 



(a) Desmidiacese, 



. 23 



Summary of Distribution, . 



53 



(b) Other Conjugatae, 



. 81 



General Remarks on 



Distribution, 



53 



VI. Chloi'ophycese, 



. 31 



Bibliography, 



. 



54 



Historical Introduction. — The first attempt at an enumeration of Irish Algse 

 is found in Threlkeld's " Synopsis Stirpium Hibernicarum," published in 

 1726. The list is a very meagre one, numbering about twelve marine 

 species. To William Tighe, however, belongs the honour of publishing, 

 in 1802, the first paper of real importance on the distribution of the 

 group in Ireland. This was entitled " Marine plants observed on the 

 coast of the County of Wexford," and was read before the Eoyal Dublin 

 Society. It included 58 marine and 2 freshwater species. Two years 

 later, in 1804, Wade published his " Plantse Eariores in Hibernia Inventse," 

 in which, on modern reckoning, 51 species of marine and 4 species of 

 freshwater Algse are enumerated. In the south of Ireland Miss Hutchins 

 was an ardent investigator of the group, while in the north the labours 

 of Templeton and Thompson were equally successful. Thompson published 

 an important paper on Irish Algse in 1836, while in the same year appeared 

 Mackay's "Flora Hibernica." This was the most important work yet 



R. I. A. PROC, VOL. XXVII., SECT. B. [^] 



