Erratic
erratic (adjective) – not attached to the substrate and therefore frequently becoming vagrant. The term generally applies to any individual thalli that are not growing attached and are potentially vagrant (passively moved by wind, animals, etc.). However, if applied to an entire species the terms erratic and vagrant are used much more specific: If all individual thalli in entire populations are typically not attached to their substrate, the entire species is vagrant. If only few isolated individual thalli, or only part of a population becomes occasionally detached, the species is called an erratic.
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