Equisetites (ek" wisetitez)

[NL., ing the Carboniferous and Tria ic periods. There is much difficulty in cla ifying the fo il Equisetaceæ, in consequence of the imperfect preservation of important portions of the specimens studied. By some authors the genus Equisetites is not admitted as having been clearly established. Some also retain the name Equisetaceæ (instead of Calamari a ) for the fo il order, as well as for the recent.