Glossary

Pentagonal

distinctive shape of a not germinated pollen in polar view.

Perforate

ref. sculture. Very minute tectum perforations which are smaller than the distance between two perforations.

Pericolpate

ref. pollen. Colpi in open order on the surface of the sporoderm.

Pericolporate

ref. pollen. Colpi which contain pori in open order on the sporoderm surface.

Periporate

ref. pollen. Pori in open order on the sporoderm surface.

Peroblate

ref. pollen. When the P/E ratio is less than 0.50.

Perprolate

ref. pollen. When the P/E ratio is greater than 2.

Perreticulate

reticulate sculpture in semitectate pollens.

Plyca

fold in the sporoderm surface.

Polar

(POLLEN) - pollen grains with a visible polarity.

Polar axis

imaginary line connecting the two poles.

Polar view

view from which it is possible to observe the shape, sculpture, cytoplasm and apertures of a pollen grain in polar position.

Polarity

pollen characteristics to possess two endowed poles of equal or different features.

Pollen

The pollen grain is the Gymnosperms and Angiosperms male germ element. Its function relates to the sexual fertilization.

Pollinium

it consists of many pollen grain massulae.

Polyad

pollen unity composed of 8-10-12-16-24-32 pollen grains.

Polybaculate

ref. sculture. Reticulate sporoderm with muri composed of several rows of bacula.

Polyplycate

sporoderm with a series of plycae (greater than 6).

Porate

pollen grain with aperture made up by pore.

Poroid

aperture like an central enlargement of the colpus similar to a pore.

Porus

simple aperture more or less of circular form.

Prolate

ref. pollen. When the pollen ratio P/E is of 1.33 to 2.00.

Prolate - spheroidal

ref. pollen. When the pollen ratio P/E is of 1.00 to 1.14.

Proximal pole

focus point in the proximal polar region of the pollen referring to the position taken in the anther techa.

Pseudocolpus

false aperture. Sporoderm furrow similar to a non functional colpus.

Pseudoechinate

sporoderm with regular but not clearly seen spinae.

Pseudoporus

false aperture. Sporoderm introflection like an unfunctional porus.

Psilate

ref. sculture. Sporoderm with more or less smooth surface.

Psiloclavate

ref. sculture. Sporoderm with smooth clavae.

Punctate

ref. sculture. Sporoderm with pimpled surface.

Punctibaculate

ref. sculture. Sporoderm with pimpled and baculate surface.

Punctigellate

ref. sculture. Sporoderm with small perforated tectum.