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Pollen
Pollen is a fine powder which contains the male gametes of plants which bear seeds. Pollen is produced by the plant's anthers. Pollen is the collective term of individual microspores[?] called pollen grain. The tapping panel dryness disease[?] of the rubber plant is caused by viruses transmitted by seed and pollen. Allergy to pollen is called hay fever[?]. The smallest pollen grain is that of __, which is 0.02-mm (0.0008-inch). Ribbonweed[?]'s pollen floats to the female flower by a boat-like structure. The transfer of pollen grains to the female is called pollination.
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