Crossword Genius

The collective bacteria and other microorganisms in an ecosystem (5)

Ross

I believe the answer is:

flora

(Other definitions for flora that I've seen before include "Plants of a region or age" , "list of plant life" , "Plant life of particular area" , "Plant life of a given place" , "The plants of an area (5)" .)

I've seen this clue in The Independent.
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