[hinkley]

The other advantage of fungi might be in the aftermath of a micrometeoroid event. Does it make more sense to cut a hole in your shielding and use up a store of fungal bricks that you brought with you, or to grow a somewhat custom patch with the right radius of curvature, and slightly larger than the hole, and then recycling any material that gets removed to apply the patch.

If the shield is actually alive (say, a layer around your emergency shelter), then you can just fill the hole with food and let the fungi patch themselves, and any damage caused by being exposed to partial vaccuum. Possibly with a mold that also acts as a temporary, reusable patch over the worst hit areas, so that a subsequent space storm doesn't catch you with your pants down.