Fossil plant, Rhynia gwynne-vaughani

Fossil plant, Rhynia gwynne-vaughani

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Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Section through Rhynie chert, a siliceous rock found in Scotland, showing the stems of a fossil plant Rhynia gwynne-vaughani. Rhynia was a primitive vascular plant consisting of an underground rhizome which bore upright aerial stems. The stems contained tracheids (primitive xylem cells for water transportation) & epidermal cells with stomata. There were no leaves or scales although the stems did have spiny hairs scattered over the surface. The fertile branches bore cylindrical sporangia at their tips, which contained the spores. These fossil plants grew to 30-60 centimetres (1-2ft) & are found mainly among rocks of the Devonian period.

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Keywords: extinct, fossil, fossils, palaeontology, paleontology, plant, plants, primitive vascular plant, rhynia gwynne-vaughani, rhynie chert, stem

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