Why not? I mean, the fungi would die out in space without oxygen but if it retained its properties it could be used just like any other material: wood, steel, c

Why not? I mean, the fungi would die out in space without oxygen but if it retained its properties it could be used just like any other material: wood, steel, ceramics, etc. The coolest part about fungus is that it will grow into its environment, so I would imagine molds (no pun intended) could be used to "grow" a panel, sheet, etc almost like natural 3D printing.