Glossary

Pollen Atlas Glossary

Oblate

ref. pollen. When the P/E ratio is of 0.50 to 0.75.

Oblate-spheroidal

ref. pollen. When the P/E ratio is of 0.88 to 1.00.

Oncus

greater development or widening of intine near apertures.

Operculum

pori thickness similar to a stopper.

Orbiculate

sporoderm with isodiametrical sculptural elements placed irregularly, similar to gemmae.

Ornamentation

elements which constitute the sculpture of a sporoderm.

Oval

distinctive shape of a (depressed or compressed) pollen in equatorial view.

Bibliography:
Bucher E., Kofler V., Vorwhol G., Zieger E., 2004 – Lo spettro pollinico dei mieli dell’Alto Adige. Azienda provinciale per la protezione dell’ambiente e la tutela del lavoro-Laboratorio biologico 676 pp
Ciampolini F., Cresti M., 1981 – Atlante dei principali pollini allergenici presenti in Italia. Università di Siena 190 pp.
Von der Ohe K., von der Ohe W., 2000 – Celler melissopalynologische sammlung CMS . Celle’s Melisopalynological Collection. Niedersachsisches Landesinstitut fur Bienenkunde.