Characteristics of the Genera Psilotum and Tmesipteris

The class represented by Psilotum and Tmesipteris features rootless sporophytes with subterranean rhizomes and aerial shoots, dichotomous branching, rhizoids for nutrient absorption, scale-like or leaf-like appendages, protostelic or siphonostelic stele, eusporangiate sporangial development, homospo

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