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Closterium (Charophyceae)

Central region with overlapping wall halves

Terminal sack containing numerous granules or crystals of barium sulfate (Brook 1987) from a lake in New Hampshire USA

Brook, A.J. 1987. Algae with a taste for the unusual. New Scientist 115(1577):55 – 57.
[Previously thought to be calcium sulfate (gypsum) -- CaS0₄^.2H₂0 -- data sensed from a scanning proton probe from SEM-generated X-rays were specific to barium and sulfur.]

Oligochaete ate Closterium and diatoms
Image by Wim van Egmond by permission of Peter Coesel, www.desmids.nl

Central black band is region of overlap of two wall halves, from pond on campus of University of New Hampshire, Durham NH USA. Image by John Dufresne

Older hemi-cell wall is stained with iron oxide (rust), from pond on campus of University of New Hampshire, Durham NH USA. Image by John Dufresne

Older hemi-cell wall is stained with iron oxide (rust), from pond on campus of University of New Hampshire, Durham NH USA. Image by John Dufresne

Closeup view of overlap of two cell walls, from pond on campus of University of New Hampshire, Durham NH USA. Image by John Dufresne

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