The results of an investigation of the soil algal flora from three different sites on a farm in Pike County, Pennsylvania, are presented. Representatives of 29 genera were recorded of whichChlamydomonas, Hormidium, Chlorococcum, andTetracystiswere most frequently encountered, and in that order of frequency. Only four blue-green algae,Anabaena, Lyngbya, Nostoc, andSchizothrizwere present in these soils. The diversity and frequency of occurrence increased between late winter and early summer. Species ofNannochloris, Stichococcus, andChlamydomonasdeveloped in soils inoculated into sea water enrichment medium (35% salinity).