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



Family — Botrydiaceae. 



120. Botrydium granulatum (L.) Grev. 



Found only once, in August 1911, on margin of Harelaw Reservoir, 

 growing there in great profusion. This very conspicuous Alga 

 is only found on drying-up mud, and the present year (1911), 

 when all ponds and reservoirs were at a very low level, has 

 revealed it in several places. Greville reports it from 

 Glasgow, but not anywhere from Mid- Lothian. 



Class— MYXOPHYCE^ (or CYANOPHYCE^). 

 Sub-Class 1.— GLAUCOCYSTIDE^. 

 Family — GlaucocystacesB. 



121. Glaucocystis Nostochinearum Itzigsh. 



In sphagnum pool, Bavelaw Moor. April. 



Sub-Class 2.— ARCHIPLASTIDEiE. 

 Order— HOBMOGONE-^. 

 Family — Stigonemacese. 



122. Stigonetna mamillosum Ag. 



On wet rocks, Pentlands. August. 



Family — SeytonemaceaB. 



123. Scytonema coactile Mont. 



In running water, attached to stones, Loganlee, Pentlands. August. 



124. S. miraUle (Dillw.) Born. & Flah. 



Bonally Burn, Pentlands. September. 



125. Tolypothrix lanata (Desv.) Wartm. 



Balerno ; Bavelaw Moor ; Craiglockhart Pond. June and Sept- 

 ember. 



126. T. tenuis Kiitz. 



Marlpit at Davidson's Mains, August ; Elf Loch, July. 



127. Desmonema Wrangelii (Ag.) Born. & Flah. 



In burn above Swanston, Pentlands. 



This Alga is very rare in Great Britain, and I have found it only 

 once. 



Family — Nostocaeeae. 



128. Nostoc muscorum Ag. 



Among moss on Allermuir, Pentlands. 



129. N. Linckia (Roth) Born. 



Craiglockhart Pond. September. 



