FRESHWATER ALGÆ FROM CAUCASUS AND TURKESTAN. 133 



17. Oscillatoria animalis Ag. 

 Pjatigorsk, sulphur springs. 



lat. trich. 3 — 4/<; long. cell. 5-6//, 



Associated with numerous diatoms, a small Navicula. 



18. Oscillatoria sanda Kütz. 



Askabad; lat. trich. 17,5 /<; long. cell. 2,5 — 3 /n. 



19. Oscillatoria tenuis Ag. 



Elborus; lat. trich. l,hf.i; long. cell. 3— 4 /<. 

 Wladikaokas — Kasbek (Only one specimen). 

 Kasbek — MIeti; lat. trich. 6— 6,5/<; long. cell. 2,5 //. 

 Askabad; lat. trich. 7,5/«; long. cell. 3 — 4 /f. 



20. Oscillatoria amoena (Kütz.) Gomont : Monographie p. 225. 

 Wittr. & Nordst. exsicc. 1532. 



Wladikaokas — Kasbek; lat. trich. 5 /<. 



Kasbek — Mleti; lat. trich. 5/<; long. cell. 3,5 — 4,5 /f. 



21. Oscillatoria hrevis Killz. 



Wladikaokas — Kasbek; lat. trich. 6 — 6,5 f.i; long. cell. 

 2,5-3,5 /^ 



22. Oscillatoria irrigua Kütz. 



Wladikaokas — Kasbek; lat. trich. l,h(.i; long. cell. 3,5 ^u. 

 Tiflis; lat. trich. 6— 8/<; long. cell. 4— 5 /<. 



23. Oscillatoria geminata Menegh. 



Kislowodsk; lat. trich. 2,5 — 3 /< ; long. cell. 6— 8 /t. 



24. Oscillatoria splendida Grev. 



Tiflis; lat. trich. 2,5 /t; long. cell. 3 /t. 



25. Oscillatoria amphibia Ag. 

 Tiflis; lat. trich. 2,5 //. 



Genus Microcoleus Desmaz. 



26. Microcoleus paludosus (Kütz.) Gom. 

 Tiflis; lat. trich. 6— 8//; long. cell. 4— 5 /f. 

 Abundant. 



