Form-genus meaning

A category of biological classification based on morphology rather than phylogeny. Used especially of fossil plants and deuteromycetes.
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A genus consisting of species superficially resembling each other but probably not closely related in their evolutionary origin.
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(taxonomy) A collection of organisms that is given formal recognition at the rank of genus with a taxonomic name, but which is known to be an artificial group rather than a natural one.

All fossilized roots of scale trees are assigned to the form genus 'Stigmaria'.

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