Sigillaria sĭjĭlâr´ēə [key], genus of fossil club moss allied to Lepidodendron , abundant in the Carboniferous period. The thick trunk was rarely branched and was covered for several feet from the top with erect leaves that were larger than those of Lepidodendron ; the leaf scars were in vertical rows. The fossilized root stocks of Sigillaria, as of Lepidodendron, are known as stigmaria. Club mosses are classified in the division Lycopodiophyta .

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