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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.
http://www.ucmp.berkeley.edu/plants/lycophyta/lycophyta.html
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» Lycopodiophyta
Find out about this ancient plant division and its classes. From Wikipedia.
http://en.wikipedia.org/wiki/Lycopodiophyta
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» Phylum Lycophyta
Descriptions and images of Isoetes, Lycopodium, and Selaginella from the three extant families.
http://botit.botany.wisc.edu/courses/systematics/Phyla/Lycophyta/Lycophyta.html
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