| After the dissolution of the callose wall, the sporopollenin wall begins to form. |
| After the respective diffusion time, sporopollenin capsules were sedimented by centrifugation. |
| At the free microspore stage, a material with a similar electron density to sporopollenin fills the whole locule and deposits over the pollen grain wall. |
| Palynomorphs may be composed of organic material such as chitin, pseudochitin and sporopollenin. |
