Definition of Lycopsida
: a subdivision of Tracheophyta coextensive with the class Lycopodineae comprising vascular plants (as the club mosses and related forms) with small leaves, sessile and adaxial sporangia, and no leaf gaps in the primary vascular cylinder — compare psilopsida pteropsida sphenopsida
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Origin and Etymology of lycopsida
New Latin, from Latin lycopsis, a plant + New Latin -ida
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