Phaeothamnion
noun
Phaeo·tham·ni·on
ˌfēəˈthamnēˌän
: a genus (the type of the family Phaeothamniaceae) of rare yellow green algae growing upon other algae and having a definite central axis and ascending lateral filaments made up of cylindrical to subovoid cells
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Merriam-Webster unabridged
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