The Fungus Has Been Planet's Dominant Lifeform Since About The Time Of The Lower Paleozoic On Earth.

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The fungus has been Planet's dominant lifeform since about
the time of the Lower Paleozoic on Earth. But when, once every
hundred million years or so, the neural net at last achieves the
critical mass necessary to become sentient, the final metamorphosis
kills off most of the other life on the planet. It is possible that
we humans can help to break this tragic cycle.

-- Lady Deirdre Skye,
"Planet Dreams"

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