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ABSTRACT
Algae have been observed in many different extreme environments. We conducted a taxonomic diatom survey from Ice Pond Run stream, Friendship Hills National Historic Site, Fayette County, Pennsylvania in 2002. This stream is chronically impacted by acid mine drainage. The pH observed was low and ranged from 1.91 to 2.22. We identified three algal genera and six species. Two species counted as Eunotia geitlerii and E. exigua showed to have frustule incised ventral deformity and addition of extra striae, which represented 13% of the community relative percentage. Pinnularia subcapitata also showed highly silicified punctae with shallow pores.