In this article we will discuss about the size of pollen and spore walls. Size: There exist much variations in sizes of pollen and spores. The size may be 5 µ × 2.4 µ as observed in pollen of forget-me-not (Myosotis) or as high as 200 µ or more as is noted in certain genera of Cucurbitaceae and Nyctaginaceae etc. [...]
Polarity is defined as the condition of having distinct poles in a pollen grain. Jackson in 1928 assumed that a pollen grain points to the poles like Silphium. Silphium laciniatum, also known as compass plant, has leaves that 'turn their edges north and south and avoid the mid-day radiation' —Willis. Pollen mother cell after meiosis forms four pollen grains that [...]
The following points highlight the nineteen main sculpture types that ornament both pollen and spore. The sculpture types are: 1. Chagrenate 2. Psilate 3. Spinula 4. Spina 5. Pilum 6. Verruca 7. Gemma 8. Clava 9. Baculum 10. Scabrate 11. Rugulate 12. Striate 13. Cicatricose 14. Reticulate 15. Corrugate 16. Foveolate 17. Fossidate 18. Canaliculate 19. Echinate. Sculpture Type # [...]