Biflagellate antherozoids in psilotopsida
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The members of the class Psilotopsida show close resemblance in fundamental characteristics to the Silurian and Devonian members of Rhyniopsida (e.g., Rhynia, Cooksonia), Zostero- phyllopsida (e.g., Zosterophyllum) and Trimero- phytopsida (e.g., Trimerophyton, Psilophyton). Psilotopsida includes only two living genera viz., Psilotum and Tmesipteris.
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