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Rhynia Gwynne-vaughanii was one of the first of the Rhynia plants to be described and is probably the most abundant of the form Rhynia. It is the most common vascular plant in the Early Devonian chert beds at Rhynie, Scotland. The axes of the plant exhibited a maximum diameter of 3 mm with the plant attaining a height of up to 20 cm. The upright axes are cylindrical and naked and upward tapering. The outer cortex consists of closely compacted uniform cells while the inner cortex is comprised of uniform cells with a well developed inter-cellular air space network. The vascular tissue comprises a zone of phloem of uniform thickness surrounding a central strand. Rhynia laid directly on the ground surface and possessed creeping rhizomes displaying repeated branching. The sporangia are not particularly common. They display a maximum size of 4 mm by 3 mm. The sporangia are located on the adventitious branches of fertile aerial axes. Being found in association with other Rhynia plants, suggests that Rhynia was tolerant of a wide range of habitats and could withstand inter-species competition.


Rhynia Gwynne-vaughanii