Crossword Genius

Growth from stagnation

Ross

I believe the answer is:

algae

(Other definitions for algae that I've seen before include "Scum" , "Seaweeds generally" , "Simple organisms, e.g. seaweeds" , "Stemless water plants found in a gale" , "Primitive organisms" .)

I've seen this clue in The New York Times.
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