Caulerpa ambigua is a species of seaweed in the Caulerpaceae family found in marine waters of the Pacific Ocean near the southern end of Japan.[
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Description
It has dwarf filiform (threadlike) fronds that are typically in length and only wide, tapering slightly along the length. The branches are arranged in a divaricate pattern and each branch is loosely closed with oppositely arranged scales called ramenta.[
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Taxonomy
Caulerpa ambigua was first formally described by Kintarô Okamura in 1897 as part of the work On the Algae from Ogasawara-jima (Bonin Islands) as published in Botanical Magazine, Tokyo. The botanical name is taken from the Latin word meaning doubtful or uncertain.[
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