Psammothidium species have wide distribution in the US, co-occur on sandy habitats, and overlap in morphology. Samples from rivers and streams were collected as part of the NAWQA program (U.S. Geological Survey). The following species were included in this study: Psammothidium bioretii (Germain) Bukhtiyarova et Round, P. chlidanos (Hohn et Hellerman) Lange-Bertalot, P. grischunum f. daonensis (Lange-Bertalot) Bukhtiyarova et Round, P. helveticum (Hustedt) Bukhtiyarova et Round, and P. subatomoides (Hustedt) Bukhtiyarova et Round. Several morphological characteristics of the valves are outlined. These features are visible with light microscopy (LM) and should be used in routine microscopic identification.
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Acad Nat Sci Philadelphia, Patrick Ctr Environm Res, Philadelphia, PA 19103 USAAcad Nat Sci Philadelphia, Patrick Ctr Environm Res, Philadelphia, PA 19103 USA
Potapova, Marina
Charles, Donald F.
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Acad Nat Sci Philadelphia, Patrick Ctr Environm Res, Philadelphia, PA 19103 USAAcad Nat Sci Philadelphia, Patrick Ctr Environm Res, Philadelphia, PA 19103 USA
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Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Tassone, Spencer J.
Besterman, Alice F.
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Woodwell Climate Res Ctr, Woods Hole, MA USA
Buzzards Bay Coalit, New Bedford, MA USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Besterman, Alice F.
Buelo, Cal D.
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Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Buelo, Cal D.
Ha, Dat T.
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Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Ha, Dat T.
Walter, Jonathan A.
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Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Univ Calif Davis, Ctr Watershed Sci, Davis, CA 95616 USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
Walter, Jonathan A.
Pace, Michael L.
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Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USAUniv Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA