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psilophyta


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A phylum of primitive tracheophyte plants that contains two extant genera – Psilotum (whisk ferns) and Tmesipteris– as well as numerous extinct forms that flourished in the Devonian period. Psilophytes have rhizoids rather than roots; the stems, which show dichotomous branching, may be naked or bear scalelike leaves.

Subjects: Genetics and Genomics.


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