Is the joist infected with something?

joe-90,

Well, i've waited a couple of months for you to come up with an answer that might make sense to an adult, and direct me to some evidence that will back up your claim. Perhaps you've been busy?

You mention " a harmless fungus living on wet timber" - given that, by definition, fungi degrade organic material, which "harmless fungus" do you think is in the pic? Perhaps you will be good enough to include a name (s), a definition, and a reference?
 

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