Pollinium

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Pollinium

 

in orchids and milkweeds, a compact mass consisting of tetrads of pollen grains. A pollinium usually develops in two pockets of the anther. Its formation is an adaptation to specialized pollination by insects. In many orchids, the pollinium is part of the pollinarium; in some, it comes loose when the insect makes contact with the inner portion of the flower. In milkweeds, the pollinia are attached in pairs to sticky disks that adhere to the insect.

References in periodicals archive ?
These marked flowers were tracked over in order to assess the number of removed pollinia from anthers, and those deposited on the stigmatic cavities.
Drawing on his theory of natural selection, Darwin predicted that a moth with a proboscis 10-11 inches long must exist, because only such a creature could both reach the nectar and be positioned while doing so to collect or deliver the pollinia (Darwin, 1862).
Six specimens were caught with orchid pollinia attached to the proboscis.
Under the magnification of a dissecting microscope, pollinia were removed from a donor flower by grasping the corpusculum with small forceps.
Anther (2.5)3 x 1.5-2 mm, yellow, apex truncate, light green; pollinia two, waxy, sulcate, ca.
Nectar parasitism of Asclepias syriaca by ants: effects on nectar levels, pollinia insertion, pollinaria removal and pod production.
Pollinarium formed by two obovoid, sulcate pollinia; stipe narrowly triangular, united to an ovoid viscidium.
We argue that blaming low fruit set on the performance of a discrete lineage of anthophilous insects as poor pollinia vectors must be approached with caution for two reasons.
In this study, male pollination success was measured as the number of pollinia removed (0, 1, or 2), whereas female pollination success was measured as the number of pollinia received (0 or 1).
Nectar parasitism of Asclepias syriaca by ants: effect on nectar levels, pollinia insertion, pollinaria removal, and pod production.
The evolution of pollinia, which occurs in the majority of orchids, functions best with specialist pollinators.
Pollinia are enclosed within the anther as four lobes in two pairs without stipe or viscidia.