Photographs by Jaime Cowgur
Sigillaria approximata
| Sigillaria approximata is a permineralized lepidodendrid stem that has a characteristically broad pith, primary xylem with an undulating margin, a zone of secondary xylem and unusual cortical tissues. In the photo on the left you can see the stem in transverse section (at left, top). The inset shows large wedges of the secondary cortical tissue, or periderm. The elongate dark areas are parichnos strands that accompany the leaf traces through the cortex. |
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| Delevoryas, T. 1957. Anatomy of Sigillaria approximata. Ameri. J. Bot. 44: 654-660. |
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