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Pollinium, or plural pollinia, is a coherent mass of pollen grains in a plant.
Most orchids have waxy pollinia. These are connected to one or two elongate stipes, which in turn are attached to the sticky viscidium.
Some orchid genera have mealy pollinia. These are tapering into a caudicle (stalk), attached to the viscidium. They extend into the middle section of the column.
The combination of pollinia, caudicles, stipes and viscidium form the pollinarium.
Pollinia is also the name of the quarterly publication of the Irish Orchid Society. http://www.pollinia.org
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