Having a stem or trunk that resembles a fern frond, or possessing characteristics of fern-like stems.
From Latin 'filix' (fern) + 'caulis' (stem) + '-ine' (adjective suffix), literally describing 'fern-stemmed' plants.
Tree ferns are filicauline—they're ferns that grew tall like trees, showing that ferns didn't stop evolving just because they're ancient; they kept exploring new body plans.
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