Abstract
Isolation of the bacteria-free clone of Anabaena macrospora from unialgal culture was attemped by using such four methods as UV irradiation, capillary-pipette washing, akinete dilution and akinete washing methods. The axenic clones were obtained by the UV irradiation and capillary-pipette washing methods. The bacteria associated with A. macrospora were isolated and identified as Micrococcus sp.. Addition of these bacterial cells had no effects on the growth and the geosmin production ability of A. macrospora.