The primary meristematic tissue located between the protoderm and procambium that gives rise to the ground tissue system. It develops into parenchyma, collenchyma, and sclerenchyma tissues that form the bulk of plant organs.
From Old English 'grund' meaning 'foundation' and Greek 'meristos' meaning 'divided.' The term emerged in the early 20th century as botanists recognized this tissue as the foundational material that fills the space between other specialized tissues.
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