Living on, growing on, or inhabiting plant stems, describing organisms specialized for stem-dwelling.
From Latin 'caulis' (stem) plus '-colous' (inhabiting), formed as an adjectival version of caulicole. Follows the same pattern as 'herbaceous' or 'aquatic' for habitat descriptors.
Caulicolous insects represent an extreme form of specialization—some bark lice and aphids evolved to live exclusively on tree stems, making them invisible to anyone who doesn't look closely at trunks and branches.
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