How does bread get moldy?

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Something must grow on stale bread whether it's in hot or cold temperature when bread is forgotten from far back in the fridge for too long. Fungus makes its own digestive enzymes and acids which diffuse out of the fungus into the material, aka, bread, in which it is growing. Many fungi are fast growers. One moderately speedy fungus grows a branch (mycelium) at a rate of about eight-thousandths of an inch/hour. So, in 24 hours,, a fungus colony of that kind can produce a total branch length of one-half mile. In 48 hours. the total length is hundreds of miles long! In a few days, you see why a loaf of bread is fully colonized by this fast growing fungus.