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I'll use Agaricus Bisporus as an example mushroom. If cultured in potato dextrose yeast extract agar, will the resulting growth grow in a normal pattern? Will the sporocarps emerge from the surface (assuming there is one) properly? Will they develop inside the agar, or emerge an an angle?

Will the plant develop at a normal rate, and to normal proportions?

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There were some experiments done in microgravity in longer space shuttle missions. The reports show that the fungi develop relatively normal but grow in random orientations instead of orientating upwards. See this images:

enter image description here

The upper image shows fungi grown on earth which are subjected to normal gravity. The lower image shows fungi (actually only the fruiting bodies) which are grown during 7 day on the Spacelab D2 mission. The fungi obviously have a way of detecting gravity to let their fruiting body grow upwards. The image is from here, the article contains more information about this. There is also a publication in this topic:

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    $\begingroup$ Thank you Chris. I guess I didn't search long enough. $\endgroup$
    – J. Musser
    Jul 25, 2014 at 4:31

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