370 The Alga-Flora of Mid- Lothian, [Sess. 



146. Ph. papyraceum (Ag.) Gom. 



Esk, on weir near Musselburgh. 



147. Ph. uncinatum Gom. 



Forming brown skin on moss, Bonally Burn. 



148. Oscillatoria limosa Ag. 



I found this Alga in enormous quantities, forming blue-green 

 films on wet sand and stones, and also free-floating, above 

 weir in Colinton Dell. July-September. Cell. diam. 14-17 fi. 

 Also in Esk, Musselburgh. August. 



149. 0. tenuis Ag. 



Blue-green film in warm water (about 35° C.), outlet of paper-mill, 

 Colinton Dell. July. 



150. 0. irrigua Kiitz. 



Among other Algae, Harelaw Reservoir. August. 



151. 0. chalyhea Mertens. 



Mill-lade, Musselburgh. August. 



152. 0. splendida Grev. 



In stagnant water, Musselburgh. August. 



153. 0. formosa Bory. 



In stagnant water, Colinton Dell ; Esk, Inveresk. 



154. 0. decolor ata G. S. West. 



Bavelaw Moor in small pool. 



This species, remarkable owing to its large vacuoles, had not been 

 found since its original description in " The Alga -Flora of 

 Cambridgeshire," 'Jour, of Bot.,' 1899, p. 264. 



Sub-Order — Trichophore^. 

 Family — Rivulariaceae. 



155. Dichothrix gypsophila (Kiitz.) Born. & Flah. 



On wet rocks near Glencorse, Pentlands. August. 



156. Rivularia Bialosettiana Menegh. 



On stones, margin of Craiglockhart Pond. August. 



157. Gloeotrichia pisum (Ag.) Thur. 



Elf Loch. August, in great numbers ; free-floating. 



Order— CO CCGGOlSrEiEl. 



Family — Chaniaesiplioniaceaa. 



158. Chamcesiphon incrustans Grun. 



On Microspora stagnorum and phanerogamic rootlets. Wet locks, 

 near Colinton. 



159. Ch. minutus (Rost.) Lemm. 



Cells 2-3 M crassa, 5 m longa. Growing on Tolypothrix lanata. 

 Bonally Burn, Pentlands. August. 



