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