In botany, describing a pollen grain or spore that has two sac-like or air-filled bladders attached to it.
From Latin 'bis' (twice) and 'saccus' (sack or pouch). Technical botanical term describing the morphology of certain pollen types, especially in conifers.
Those little pollen sacs you see floating in spring air as 'yellow dust'?—many are bisaccate, and those air bladders help them travel incredible distances on the wind like tiny botanical parachutes!
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