The plural of amphigastrium; a pair of small leaves or leaf-like structures on liverworts arranged beneath the stem.
From Greek 'amphi-' (both sides) and 'gastrium' (related to belly or underside). A botanical term for appendages in bryophytes.
Liverworts are ancient plants that haven't changed much in 400 million years, and these tiny amphigastria are specialized structures that help them absorb water and minerals—every millimeter of these primitive plants is optimized for survival in damp places.
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