Which plant group was the first to develop extensively thickened woody stems?

Name: Which plant group was the first to develop extensively thickened woody stems?
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Question

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Progymnosperms were the first group of plants to develop extensively thickened woody stems, although they did not have true wood like modern trees. Lycopods, Ginkgos, and Conifers also have woody stems but appeared later in the evolutionary timeline. Angiosperms have woody stems as well, but they are not the first group to do so.

Which Plant Group Was the First to Develop Extensively Thickened