354 The Alga^Flora of Mid-Lothtan, [Sess. 



X.— ^ CONTRIBUTION TO THE ALGA-FLORA 

 OF MID-LOTHIAN. 



By Mr F. L. M'KEEVEK, F.R.M.S. 



{Read April 26, 1911.) 



In the * Transactions ' of our Society for last Session I gave 

 a list of 41 species of freshwater Algse collected and mounted 

 on slides during the year 1909, and I then promised to 

 submit later a complete list of all the species I had found in 

 the county of Mid-Lothian during the last four years. For 

 various reasons I could not include the Desmidiaceae (of which 

 a considerable number occur in this county), the Diatomaceae 

 (or Bacillariese), and the Peridinieae. My list therefore con- 

 tains the freshwater Algse exclusive of the groups named 

 above. 



It will be observed from the localities mentioned under 

 each species that I explored only a part of this county for 

 freshwater Algae, and this list must therefore be looked upon 

 as merely a small contribution to the Alga- flora of Mid- 

 Lothian. As I could make only occasional visits to Edinburgh 

 and its surroundings, I restricted myself to the more accessible 

 parts of the Pentland Hills, principally the surroundings of 

 Colinton and Balerno. The name of Bavelaw Moor occurs 

 very frequently in this list, and in order to give an idea of 

 this splendid hunting-ground for Algae, easily reached from 

 Balerno, I submit herewith a record of the Algae found in one 

 single small tube obtained on 6 th April 1911 by squeezing a 

 single piece of sphagnum from one of the bog-pools of this 

 moor. Professor G. S. West kindly examined the contents of 

 the tube for me, and sent me the following list : — 



Desmidiaceae : — 



Hyalotheca mucosa (Dillw. ) Ehrenb. 



Arthrodesmus Incus (Breb.) Hass., var. Ralfsii W. & G. S. West. 



Closterium parvulum Nag. 



II juncidum Ralfs. 



II Kutzingii Br^b. 



Cosmarium Portianum Arch. 



II tinctum Ralfs. 



II Regnesii Reinsch. 



