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Spirogyra (Charophyceae)

Spirogyra sp.
Mucilagenous sheath is evident

Spirogyra sp.

Spirogyra sp.

Spirogyra sp.
Replicate cross-wall is evident

Spirogyra sp.
Replicate cross-wall is evident

Spirogyra sp.
Replicate cross-wall is evident

Spirogyra sp.
Replicate cross-wall is evident

Spirogyra sp.

Spirogyra sp.

Spirogyra sp.

Spirogyra sp., Willand Pond, Dover, NH USA, pyrenoids are apparent
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

Spirogyra sp., Willand Pond, Dover, NH USA
Unusual aberrant chloroplast morphology in center cell
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

Spirogyra sp., Willand Pond, Dover, NH USA, stretched helices
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

Spirogyra sp., Willand Pond, Dover, NH USA, stretched helix
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

Spirogyra sp., Willand Pond, Dover, NH USA
Disturbed chloroplast
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

Spirogyra sp., Willand Pond, Dover, NH USA
Turgid cell detached from filament with a "disturbed" chloroplast
Photo by Amanda Murby, University of New Hampshire, Durham, NH USA

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Cell elongation before (L) and after (R) ethylene addition
Extracted from Jul et al. 2015.

Ju, C., B. Van de Poel, E.E. Cooper, et al. 2015. Conservation of ethylene as a plant hormone over 450 million years of evolution. Nature Plants. Macmillan Publishers. (7 pp). online

Spirogyra conjugation tubes and zygotes
Photograph presented by Dana Krempels,Miami University, Coral Gables FL, USA, posted online

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