Gerald - my wife's anatomy instructor in med school did die from formaldehyde exposure. He never
even made it to 40. I substitute thymol or glyaxol whenenver possible. But fungus per se ... I too live
in a damp climate and just picked up a case of dessicant canisters, like they use in gun safes (pretty
much a hydroscopic clinker mix of lime and rock salt). Some fungal spores can live for centuries if not millennia. They're everywhere.