The lycophytes are the oldest extant lineage of vascular plants and contains the club mosses and quillworts. As with the ferns, the gametophytic stage of growth is small and inconspicuous, with the sporophyte being the dominant stage of growth. Extant species are small and herbaceous, however, the fossil records show that many of their ancestors were trees.

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Introduction to the Lycophyta
An introduction to club mosses and scale trees, their life history, morphology, ecology, systematics and fossil history.
Lycopodiophyta
Find out about this ancient plant division and its classes. From Wikipedia.

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