| preliminary survey of edaphic algae in al-hasa region, saudi arabia. | five soil samples were taken from different cultivated sites from the north villages of al-hasa. three algal groups were recorded throughout this study, bacillariophyta, cyanophyta and chlorophyta. fifty-two genera of algae were identified in all the soils sampled during this investigation. out of these, 11 genera belonged to the chlorophyta; 16 genera belong to bacillariophyta and 25 genera to cyanophyta. penniate bacillariophyta (nitzschia, gyrosigma), oscillatorid cyanophyta (osillatoria, pho ... | 2007 | 19090128 |