A reconstruction of Equisetum columnare and notes on its elator bearing spores

Abstract

The aerial stem of Equisetum columnare differs from that of Recent species in being smooth and in possessing separate subepidermal fibres instead of collenchymatous ribs. Its spores, however, have similar elators.

A restoration of the whole plant brings several point of uncertainty to notice, in particular where the cones were borne. It places parts known as separate fragments in particular positions and assigns their functions. This is done in the hope that directed search might demonstrate their nature and position.