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Psaronius

noun
Psa·​ro·​ni·​us | \ səˈrōnēəs\

Definition of Psaronius

: a genus of fossil ferns based on tree fern trunks with a vascular system that is a polycyclic dictyostele — see starling stone

History and Etymology for Psaronius

New Latin, from Latin, a precious stone; from its speckled appearance when polished

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