A small leaf or leaf-like structure on liverworts positioned on the ventral (underside) of the stem.
From Greek 'amphi-' (on both sides) and 'gastrium' (belly). A singular taxonomic term from bryology, the study of mosses and liverworts.
These tiny structures on liverworts represent a completely different evolutionary experiment from true leaves—they're so ancient and specialized that studying them is like reading a instruction manual for how the first land plants adapted to life on shore.
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