What term describes pollen with a P/E diameter greater than 2?

The term that describes pollen with a P/E (polar/equatorial) diameter greater than 2 is "perprolate." This classification is part of the system used to describe the shape and dimensions of pollen grains. A perprolate pollen grain has an elongated shape where the polar diameter significantly exceeds the equatorial diameter, indicating that it is more elongated than a standard prolate shape.

In palynology, understanding these classifications helps in identifying different types of pollen, which can be crucial for various studies, including those related to ecological and environmental assessments, allergy research, and the study of plant evolution. The distinction of pollen morphology aids in taxonomic classifications and has implications in understanding how pollen disperses and the potential allergenic properties it may possess.

The other terms mentioned refer to different pollen shapes, but they do not apply to grains with a P/E diameter greater than 2. Peroblate, for instance, describes pollen with a P/E ratio less than 1, while subperprolate indicates a lesser degree of elongation than the strictly perprolate category. Globulate generally refers to round or globular pollen shapes, which would not apply here either.