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Isoetes welwitschii A. Br. ex Kuhn

leaf arrangement

Kubitzki et al
spiral
URI: http://purl.obolibrary.org/obo/PATO_0000404

Definition: A shape quality inhering in a bearer by virtue of the bearer's being curled or wound (especially in concentric rings or spirals).

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

Definition: spores bearing a Y shaped scar, indicating that they were arranged in a tetrahedral spore tetrad

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

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