1 9 1 o-i 9 1 1 .] The Alga-Flora of Mid-Lothian. 363 



these were found in a fertile condition. Specimens with 

 zygospores seem to be comparatively rare in Mid-Lothian. 

 A careful search, and keeping the sterile filaments under 

 culture in order to await the production of zygospores, 

 would no doubt extend the list of Spirogyras considerably. 



The second family of the Order Conjugatse, the Besmidiacem^ 

 is not represented in this list. 



Order— PROTOCOCCOIDE^. 

 Family — Volvocaceae. 



Sub-Family — Chlamydomonade^. 



63. Carteria multifilis (Fresen.) Dill. 



Elf Loch. 



64. Chlamydomonas pulvisculus Ehrenb. 



Elf Loch. 



65. Sphcerella lacustris (Girod.) Wittr. { = Chlamydococcus plumalis (Flot.) 



A. Br. and Hcematococcus lacustt'is (Girod.) Eostaf.) 

 Species of the genera Carteria and Chlamydomonas are nearly 

 always met with in collections from ponds and ditches in this 

 county. I enumerate two species only, as the identification 

 requires great care and study. S'phcerella lacustris is no doubt 

 also a common Alga of Mid-Lothian, but I have only been 

 able to identify it with certainty from one collection obtained 

 in a small rain-pool near Inverleith Gardens, Edinburgh. 



Sub-Family — Phacote^. 



66. Phacotus lenticularis (Ehrenb.) Stein. 



The remarks made about Carteria and Chlamydomonas hold also 

 good for this Alga. Elf Loch ; Marlpit at Davidson's Mains. 



Sub-Family — Volvoce^. 



67. Gonium pectorale Miill. 



Elf Loch, rare, August ; Craiglockhart Pond, September ; Hare- 

 law Reservoir, July. 



{Stephenosphcera pluvialis Cohn I have been unable to find in any 

 of the ponds or lochs around Edinburgh. It was found, how- 

 ever, in the Elf Loch in 1897 — see 'Trans.,' vol. iii. p. 381.) 



68. Pandorina morum (Miill.) Bory. 



This Alga is one of the Volvoceae frequently met with everywhere. 

 It is common in the Elf Loch, Craiglockhart Pond, Marlpit 

 at Davidson's Mains, and also in many ditches and pools. It 



