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Sphaerostephanos williamsii (Copel.) Holtt.

spore arrangement

Kubitzki et al
monolete
URI: http://eol.org/schema/terms/monolete

Definition: spores bearing a single linear scar, indicating that they were arranged in a tetragonal spore tetrad

Attribution: https://www.ucl.ac.uk/GeolSci/micropal/spore.html

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