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Two Rhynie chert sporophytes reconstructed. (a,b) Aglaophyton majus: (a) habit (ca 15 cm tall) and (b) detail of sporangia with one on left cut away to reveal inner spore cavity. (c,d) Horneophyton lignieri: (c) habit (ca 10 cm tall) and (d) detail of sporangia with one on left cut away to reveal inner spore cavity (s) and columella (c). Adapted from drawings by Pollyanna Lidmark first published in [19].
