Sigillaria

Rarity: Common

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What Wikipedia says

Sigillaria is a genus of extinct, spore-bearing, arborescent lycophyte, known from the Carboniferous and Permian periods. It is related to the more famous Lepidodendron, and more distantly to modern quillworts.

Excerpt from the Wikipedia article “Sigillaria”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: en:User:Jmpenzone, Public domain, via Wikimedia Commons.