FRESHWATER ALGÆ FROM CAUCASUS AND TURKESTAN. 137 



44. Cosmarium reniforme (Ralfs) Arch. 



Wladikaokas — Kasbek ; long. 50 in ; lat. 44 /.i ; lat. isthm. 16 /.i. 



45. Cosmarium suhcrenatmn Hantzsch. 

 long. 27,5 ^t; lat. 22 /t; lat. isthm. 7,5 /<. 

 Wladikaokas — Kasbek. 



46. Cosmarium subprotumidum Noidst. 

 Wladikaokas — Kasbek. 



47. Cosmarium Botrytis Menegh. 



Wladikaokas — Kasbek, long. 49 ^<; lat.40/<; lat. isthm. 12,5 ^(. 



Rather smaller than the typical form. 



Askabad. 



Genus Staurastrum Mey en em. Ralfs. 



48. Staurastrum punctulatum Bréb. 

 Wladikaokas — Kasbek. 



Family Zygnemaceæ. 

 Genus Zygnema Ag. 



49. Zygnema sp. (sterile!) 

 Wladikaokas — Kasbek; MIeti — Douchet. 



Genus Spirogyra Link. 



50. Spirogyra porticalis (Müll.) Cleve. 



Wladikaokas— Kasbek; lat. fil. 40—50;«; long. zyg. 60 /.i; 

 lat zyg. 40—45 /<. 



51. Spirogyra sp. (sterile!) 



Wladikaokas — Kasbek; Kasbek — Mleti; MIeti — Douchet; 

 Tiflis; Askabad. 



Family Mesocarpaceæ. 

 Genus Mougeotia Ag. 



52. Mougeotia sp. (sterile!) 

 Kasbek — MIeti; Mleti — Douchet. 



