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PalDat - Palynological Database

an online publication on recent pollen

Welwitschia mirabilis

Taxonomy: Gymnospermae, Gnetales, Welwitschiaceae, Welwitschia

Published: 2020-02-25

Pollen Description

Shape, Size and Aperture

pollen unit: monad,  dispersal unit and peculiarities: monad,  size (pollen unit): medium-sized (26-50 µm),  pollen class: plicate,  polarity: heteropolar,  shape: oblate,  outline in polar view: elliptic,  shape (dry pollen): oblate,  outline in polar view (dry pollen): elliptic,  infoldings (dry pollen): aperture(s) sunken,  aperture number: 1,  aperture type: sulcus,  aperture condition: sulcate,  aperture peculiarities: -

Ornamentation and Structure

LMornamentation LM: -,  nexine: -,  sexine: -,  SEMornamentation SEM: plicate, psilate,  TEMtectum: -,  infratectum: -,  foot layer: -,  endexine: -,  intine: -,  wall peculiarities: -

Miscellaneous

pollen coatings: -,  reserves in cytoplasm: -,  cell number: -,  Ubisch bodies: present

Author(s) of diagnosis: Halbritter, Heidemarie

Pictures

habitus

1. habitus

inflorescence(s)

2. inflorescence(s)

flower(s)

3. flower(s)

hydrated pollen

4. hydrated pollen

hydrated pollen

5. hydrated pollen

hydrated pollen grains

6. hydrated pollen grains

distal proximal view

7. distal proximal view

proximal polar view

8. proximal polar view

equatorial view

9. equatorial view

equatorial view

10. equatorial view

oblique view

11. oblique view

polar proximal view

12. polar proximal view

polar distal view

13. polar distal view

equatorial view

14. equatorial view

aperture detail

15. aperture detail

exine surface

16. exine surface

exine surface

17. exine surface

exine surface,apex

18. exine surface, apex

exine surface

19. exine surface

dry pollen

20. dry pollen

Ubisch bodies on inner anther wall

21. Ubisch bodies on inner anther wall

Ubisch bodies on locule wall

22. Ubisch bodies on locule wall

Ubisch bodies on locule wall

23. Ubisch bodies on locule wall

Picture legend

  1. habitus, photographer: Berger, A.
  2. inflorescence(s), photographer: Berger, A.
  3. flower(s), photographer: Berger, A.
  4. hydrated pollen - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  5. hydrated pollen - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  6. hydrated pollen grains - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  7. distal proximal view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  8. proximal polar view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  9. equatorial view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  10. equatorial view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  11. oblique view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  12. polar proximal view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  13. polar distal view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  14. equatorial view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  15. aperture detail - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  16. exine surface - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  17. exine surface - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  18. exine surface, apex - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  19. exine surface - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  20. dry pollen - dry, sputter coated with gold, photographer: Halbritter, H.
  21. Ubisch bodies on inner anther wall - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  22. Ubisch bodies on locule wall - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  23. Ubisch bodies on locule wall - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.

Literature

  • Halbritter, H (1998) Preparing living pollen material for scanning electron microscopy using 2,2-dimethoxypropane (DMP) and criticalpoint drying. Biotechnic Histochem 73: 137–143

Copyright and Citation

Cite this publication as:

Halbritter H., Berger A. 2020. Welwitschia mirabilis. In: PalDat - A palynological database. https://www.paldat.org/pub/Welwitschia_mirabilis/303665;jsessionid=260A4F5A0C2E04D66CD6CD33ECE093D5; accessed 2020-05-27

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