Represented by only two living genera, Psilotum and Tmesipteris , ____ resemble the extinct Cooksonia . Having no true roots or leaves, these seedless vascular plants are essentially forking green stems.

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Whisk ferns, represented by the genera Psilotum and Tmesipteris, resemble the extinct Cooksonia and are characterized by their simple structure, lacking true roots or leaves, and consisting mainly of forking green stems.

Represented by Only Two Living Genera, Psilotum and Tmesipteris