ON SCOTTISH DESMIDIE/E 179 



18. S. bicorne, Hauptfl. — Extremely rare. Aberdeen — north and 



west margins of Birsemore Loch. 



19. S. bidentatum, Wittr. (S. longispinum, Lundell, not of Bailey). 



— Very rare. Argyle — Glen Coe (1878). 



20. S. Biencanum, Rabenh. — Rare. Caithness — Loch Hempriggs ; 



Kincardine — Kerloch and Blackhall ; Forfar — Balquhadly in 

 Fern. 



Forma Spetsbergense, Wille. — Very rare. Aberdeen — 

 Lochnagar near the summit. 



21. 6". bifidum (Ehr.), Breb. — Extremely rare. Ross — at Poolewe 



(July 1889, Rev. D. Campbell). 



22. S. botrophilum, Wolle. — Extremely rare. Inverness — on Cairn- 



gorm, at 3500 feet (Mr. A. I. M'Connochie). 



23. S. brachiatum (Ehr.), Breb. — Not uncommon. Ross, Inverness, 



Aberdeen, Kincardine, Forfar, Perth, Argyle, Arran. 



With zygospores, in Kincardine — at Curran and Cloch- 

 naben. 



24. S. brachycerum (Ehr.), Breb. — Not common. Aberdeen, Kin- 



cardine, Forfar, Perth. 



25. S. Braunii, Reinsch. — Very rare. Aberdeen — near Aboyne on 



the "Old Road." 



26. S. Brebissonii, Archer. — Not common. Ross, Aberdeen, and 



Kincardine, common ; Forfar — Barrehvell near Brechin ; 

 Perth — Hill of Alyth, Loch Lundie, and Birnam Hill ; Fife 

 — Tents Moor. 



27. S. brevispimon, Breb. — Not common. Sutherland, Inverness, 



Aberdeen, Kincardine, Forfar, Perth. 



28. S. Cerastes, Lundell. — Extremely rare. Aberdeen — near Loch 



Dawan. 



29. S. clepsydra, Nordst. — Extremely rare. Aberdeen — at Achnerran, 



in Logie-Coldstone. 



30. 6". Chvci {St. lave, Ralfs; (3 Clevei, Wittr.) — Very rare. Inver- 



ness — at Brin, and in Skye near Loch Coruisk ; Argyle — Glen 

 Coe. 



31. .V. coarctation, Breb.- — Very rare. Kincardine — at Cammie in 



Strachan. 



\2. S. connatum {St. defectum^ y connatum y Lund.) — General. 



^^. S. controversion, Breb.— General 



34. S. cordatum, Gay. — Very rare. Inverness— near Brin (Mrs. 



I irquharson). 



35. .V. corniculation, Iaindell. — Very rare. Aberdeen — Bottomeiui 



and Heughhead, Aboyne. 



