[dodslaser]

Just dry the fungus and burn it. The process is fairly analogous to photosynthesis in plants, so we've basically already been doing this since we learned to make fire, just with a different source of radiation.

[mrweasel]

That would be fun on a space craft. Steam power spacecraft, powered by burning mushrooms.

[friendzis]

Humans become interstellar species.

Energy source is still heated water.

[ethmarks]

And the mushrooms would be powered by cosmic radiation...