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. 2017 Jun 7;5:e3373. doi: 10.7717/peerj.3373

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© 2017 Grímsson et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A–E) Close-ups of sculpturing in area of mesocolpium and along margo in fossil pollen. (F–H) Close-ups of sculpturing in area of mesocolpium and along margo in extant pollen. (A, B) Profen MT2. (C) Profen MT3. (D) Profen MT4. (E) Profen MT5. (F) Peraxilla tetrapetala. (G) Amylotheca sp. (H) Ligaria cuneifolia. Scale bar: (A–H) = 1 μm.