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Maybe it doesn't actually have much to do with light as it does with nutrients. Say the mushrooms are parasitic on other plants and aggressively predatory. Their spores invade a forest, latch onto ...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:18Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/60468 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/