BASAL STEM ANATOMY OF PSARONIUS |
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| Authors: | Benton M Stidd Tom L Phillips |
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| Institution: | Department of Botany, University of Illinois, Urbana |
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| Abstract: | The basal stem anatomy of three young sporophytes of Psaronius from the Middle Pennsylvanian of Kansas and Illinois is described. The origin of the second stelar cycle is demonstrated in the transition from a simple, amphiphloic siphonostele to a dicyclic dictyostele. Petioles with C-shaped vascular strands are attached to the stem in a one-third phyllotaxy. A root mantle is lacking. Basal stem anatomy of Psaronius is compared with that of living genera of the Marattiaceae. |
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