NASA has awarded a Phase III NIAC grant to a proposal investigating growing structures off-planet using fungal mycelial composites - mushrooms. Since this is phase III, the team has already completed two phases of testing: growing structures on different food substrates and using inflatables for phase II. For phase three, they'll test the technique on an orbiting space station to see if mushrooms can grow into usable shapes in weightlessness.
https://www.nasa.gov/directorates/stmd/niac/mycotecture-off-planet-en-route-to-the-moon-and-mars/