Being in a state of having a club-like or peg-like structure, or having been shaped into small club forms.
From 'clavellate' + '-ed' (past participle or adjectival suffix). A rarer variant emphasizing the completed state of the form.
The difference between 'clavellate' and 'clavellated' is subtle but important to taxonomists—it's like the difference between describing something's shape versus describing it in a particular condition or state.
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