Sr. No. | Allergenic Plant Species | Pollen Size (µm) | Pollen Type | Mesocolpium Distance Between Two Colpi (µm) | P/E Ratio | Exine Thickness (µm) |
1. | Betula pendula Roth | 10 - 25 | Tricolpate | 4.99 | 1.140 | 1.866 |
2. | Fraxinus pennsylvanica Marshall | <10 | Prolare-Spheroidal | 5.05 | 1.12 | 1.32 |
3. | Magnolia ×soulangeana Soul.-Bod. | 10 - 25 | Tricolpate | 11.8 | 1.06 | 1.052 |
4. | Populus alba L. | <10 | Tetracalpoate | 5.34 | 1.06 | 1.746 |
5. | Pinus brutia var. eldarica (Medw.) Silba | 25 - 50 | Heteropolar | 5.0 | 1.14 | 1.87 |
6. | Quercus robur L. | <25 | Tricolpate | 4.9 | 1.1 | 1.8 |