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PalDat - Palynological Database

an online publication on recent pollen

Welwitschia mirabilis

Taxonomy: Gymnospermae, Gnetales, Welwitschiaceae, Welwitschia

Published: 2021-02-19

Pollen Description

Shape, Size and Aperture

pollen unit: monad,  dispersal unit and peculiarities: monad,  size (pollen unit): medium-sized (26-50 µm),  size of hydrated pollen (LM): 51-100 µm,  shortest polar axis in equatorial view (LM): -,  longest polar axis in equatorial view (LM): 51-100 µm,  shortest diameter in equatorial or polar view (LM): 31-35 µm,  longest diameter in equatorial or polar view (LM): -,  pollen class: plicate,  polarity: heteropolar,  P/E-ratio: oblate,  shape: -,  outline in polar view: elliptic,  dominant orientation (LM): equatorial,  P/E-ratio (dry pollen): oblate,  shape (dry pollen): -,  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: plicate, psilate,  nexine: -,  sexine: -,  SEMornamentation SEM: plicate, psilate,  suprasculpture SEM: -,  TEMtectum: -,  infratectum: -,  foot layer: -,  endexine: -,  intine: -,  wall peculiarities: -,  supratectal element: -

Miscellaneous

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

Author(s) of diagnosis: Halbritter, Heidemarie; Heigl, Helmut

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

6. hydrated pollen

hydrated pollen

7. hydrated pollen

hydrated pollen

8. hydrated pollen

hydrated pollen grains

9. hydrated pollen grains

distal proximal view

10. distal proximal view

proximal polar view

11. proximal polar view

equatorial view

12. equatorial view

equatorial view

13. equatorial view

oblique view

14. oblique view

polar proximal view

15. polar proximal view

polar distal view

16. polar distal view

equatorial view

17. equatorial view

aperture detail

18. aperture detail

exine surface

19. exine surface

exine surface

20. exine surface

exine surface,apex

21. exine surface, apex

exine surface

22. exine surface

dry pollen

23. dry pollen

Ubisch bodies on inner anther wall

24. Ubisch bodies on inner anther wall

Ubisch bodies on locule wall

25. Ubisch bodies on locule wall

Ubisch bodies on locule wall

26. 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 - fresh, glycerine, unstained, photographer: Heigl, H.
  5. hydrated pollen - fresh, glycerine, ruthenium red, photographer: Heigl, H.
  6. hydrated pollen - fresh, glycerine, ruthenium red, photographer: Heigl, H.
  7. hydrated pollen - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  8. hydrated pollen - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  9. hydrated pollen grains - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  10. distal proximal view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  11. proximal polar view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  12. equatorial view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  13. equatorial view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  14. oblique view - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  15. polar proximal view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  16. polar distal view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  17. equatorial view - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  18. aperture detail - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  19. exine surface - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  20. exine surface - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  21. exine surface, apex - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  22. exine surface - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  23. dry pollen - dry, sputter coated with gold, photographer: Halbritter, H.
  24. Ubisch bodies on inner anther wall - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  25. Ubisch bodies on locule wall - dry, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  26. 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., Heigl H., Berger A. 2021. Welwitschia mirabilis. In: PalDat - A palynological database. https://www.paldat.org/pub/Welwitschia_mirabilis/305486;jsessionid=8BF0208CA47B2AB584F656EC5F6B392E; accessed 2024-03-29

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