Living or growing on leaves; describing organisms, especially fungi and insects, that inhabit leaf surfaces.
From Latin 'folium' (leaf) plus 'colous' (from 'colere,' to live), a scientific suffix meaning 'living on or in,' used in taxonomy to describe habitat preferences.
Rust fungi and leaf miners are foliicolous—they literally live their entire lives on leaf surfaces, making them some of nature's most specialized creatures with the tiniest territories!
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