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Yunia is a genus of extinct vascular plants from the Early Devonian (Pragian or Siegenian stage, around 413 to 411 million years ago). It was first described from the Posongchong Formation of Yunnan, China. The leafless plant consisted of spiny stems, some 2 to 5 cm (0.79 to 1.97 in) wide, which branched dichotomously at wide angles in a cruciate arrangement. Each stem contained vascular tissue with one or two strands of protoxylem. The spore-forming organs (sporangia) were elongated and borne on short stalks. The spores had a relatively smooth sculptural pattern and were trilete (i.e. each spore has three lines on it resulting from its formation in a tetrahedral set of four spores).
In 2004, Crane et al. published a simplified cladogram for the polysporangiophytes in which Yunia is basal to the lycophytes (clubmosses and relatives).
Text excerpted from the Wikipedia article Yunia by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
