pollinium (pl. pollinia)
A mass of waxy pollen or of coherent pollen grains, as found in Asclepias and Orchidaceae.
GardenWeb Glossary of Botanical Terms
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pollinia -- A mass of fused pollen produced by many orchids.
protostele -- When a plant's vascular tissue develops in a solid central bundle, it is said to have a protostele. See also siphonostele and eustele.
Where the pollinia become physically attached to the pollinator and how they get there is individual to each given orchid species. One example involves euglossine bees, common shared pollinators for orchids in Central and South America.
Instead it's fused into waxy masses called pollinia. Behind the pollinia is the stigmatic surface.
Pollen grains, collectively known as pollen, are so characteristic of the different species that they are used for identification purposes.
In orchids and milkweeds pollen are in masses known as pollinia.
 See also: Plant, Pollen, Gardening, Genera, Epiphyte
  
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