TOPIC: Mold in sub-flooring???

Can this be mold growing in the wood of the sub-flooring?

First photo: No
Second photo: That's usually ink splatter from the stamping machine at the OSB factory

If you're really concerned, you would need to obtain a specialist to take samples and have them analyzed at a laboratory.

Could the first picture be some sort of fungus growth? On the pipe there is a little white substance that is definitely dried out now, that looks like it may have came from up there. Also, right underneath this spot, basically where I was standing when I took the picture I have begun to see some sawdust accumulation. I am almost certain it is not from an infestation of termites or carpenter ants.

I agree that the 2nd picture is definitely ink splatter. I have noticed it in several other areas, and they are all within inches of a stamp.

I have also noticed that there appears to be some dry rot on the railings of our stairway. I changed the ink splatter picture to the one of the railing. This is located on the first floor of the home, and we have never had any sort of leak/spill or reason it would look like this.

This is located on the first floor of the home, and we have never had any sort of leak/spill or reason it would look like this.

Have you ever had the carpets cleaned? Problem with wood setting on carpeting is it will wick any moisture out of the carpets. DYI carpet cleaning machines, and even some lazy "professionals" will leave the carpets damp after cleaning, thus the need for AIR FLOW!