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PalDat - Palynological Database

an online publication on recent pollen

Rhododendron macrosepalum

Taxonomy: Spermatophyta, Ericales, Ericaceae, Rhododendron

Published: 2010-06-21

Pollen Description

Shape, Size and Aperture

pollen unit: tetrad,  dispersal unit and peculiarities: tetrad,  size (pollen unit): medium-sized (26-50 µm),  size of hydrated pollen (LM): -,  shortest polar axis in equatorial view (LM): -,  longest polar axis in equatorial view (LM): -,  shortest diameter in equatorial or polar view (LM): -,  longest diameter in equatorial or polar view (LM): -,  pollen class: tetrad,  polarity: heteropolar,  P/E-ratio: oblate,  shape: -,  outline in polar view: circular,  dominant orientation (LM): -,  P/E-ratio (dry pollen): -,  shape (dry pollen): -,  outline in polar view (dry pollen): -,  infoldings (dry pollen): interapertural area sunken,  aperture number: 3,  aperture type: colporus,  aperture condition: colporate,  aperture peculiarities: margo

Ornamentation and Structure

LM  ornamentation LM: -,  nexine: -,  sexine: -,  SEM  ornamentation SEM: microclavate, fossulate,  suprasculpture SEM: -,  TEM  tectum: atectate,  infratectum: -,  foot layer: -,  endexine: -,  intine: -,  wall peculiarities: viscin threads,  supratectal element: -

Miscellaneous

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

Author(s) of diagnosis: Buchner, R.; Halbritter, H.

Pictures

inflorescence(s)

1. inflorescence(s)

inflorescence(s)

2. inflorescence(s)

hydrated tetrads

3. hydrated tetrads

hydrated tetrad

4. hydrated tetrad

hydrated tetrad

5. hydrated tetrad

apertures

6. apertures

exine surface

7. exine surface

polar area

8. polar area

insertion of viscin thread

9. insertion of viscin thread

dry tetrads

10. dry tetrads

Ubisch bodies on inner anther wall

11. Ubisch bodies on inner anther wall

Picture legend

  1. inflorescence(s), photographer: Buchner, R.
  2. inflorescence(s), photographer: Buchner, R.
  3. hydrated tetrads - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  4. hydrated tetrad - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  5. hydrated tetrad - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  6. apertures - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  7. exine surface - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  8. polar area - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  9. insertion of viscin thread - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  10. dry tetrads - dry, sputter coated with gold, photographer: Halbritter, H.
  11. Ubisch bodies on inner anther wall - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.

Literature

  • Bowers CG () The development of pollen and viscin strands in Rhododendron catawbiense. Bull Torrey Bot Club 57: 285-313
  • Cullen J, Chamberlain DF (1978) A preliminary synopsis of the genus Rhododendron: II. Notes Roy Bot Gard Edinburgh 36: 105-126
  • Kaul V, Theunis CH, Palser BF, Knox RB, Williams EG (1987) Association of the generative cell and vegetative nucleus in pollen tubes of Rhododendron. Ann Bot 59: 227-235
  • King MJ, Buchmann SL (1995) Bumble bee-initiated vibration release mechanism of Rhododendron pollen. Amer J Bot 82: 1407-1411
  • Krutzsch W (1991) Gliederung, Verbreitung und Entstehung der Gattung Rhododendron - Eine Synthese aus botanischer, paläobotanischer und geologischer Sicht. Feddes Rep 102: 1-2, 11-28
  • Palser BF, Rouse JL, Williams EG (1992) A scanning electron microscope study of the pollen tube pathway in pistils of Rhododendron. Can J Bot 70: 1039-1060
  • Taylor P, Kenrick J, Li Y, Kaul V, Gunning BES, Knox RB (1989) The male germ unit of Rhododendron: quantitative cytology, three-dimensional reconstruction, isolation and dedection using fluorescent probes. Sex Pl Reprod 2: 254-264
  • Zetter R, Hesse M (1996) The morphology of pollen tetrads and viscin threads in some Tertiary, Rhododendron-like Ericaceae. Grana 35: 285-294

Copyright and Citation

Cite this publication as:

Buchner R., Halbritter H. 2010. Rhododendron macrosepalum. In: PalDat - A palynological database. https://www.paldat.org/pub/Rhododendron_macrosepalum/107906; accessed 2025-11-04

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