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Macivera is a genus of extinct vascular plants. Fossils were found in sediments in Bathust Island, Nunavut, Canada, from the upper Silurian (Ludfordian, around 430 to 420 million years ago). The leafless stems (axes) branched dichotomously and were relatively thin, being between 0.7 and 1.0 mm wide. Spore-forming organs or sporangia, which were elliptical, being longer than wide, were borne on the end regions of stems. Macivera is considered to be a zosterophyll.
Text excerpted from the Wikipedia article Macivera by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
