This is what AI shared:
While it is possible for Aspergillus brasiliensis to grow on coffee grounds, it is not the only—or even the most common—fungus found there. Coffee grounds frequently attract a wide variety of white-to-green and black molds (such as Aspergillus niger and Penicillium) as part of the natural decomposition process.
Are Aspergillus brasiliensis and Aspergillus niger the same?
For many years, they were considered the exact same fungus, and they are nearly indistinguishable to the naked eye. Both belong to the “black aspergilli” group and produce black spores. However, DNA sequencing in 2007 revealed them to be distinct species, with A. brasiliensis officially split from the broader A. niger complex.
Should you be worried?General Environment:
The fuzzy or powdery mold growing on used coffee grounds is a normal part of the breakdown process and is generally considered harmless if you are composting.Health & Allergies: Inhaling heavy concentrations of mold spores can cause respiratory irritation or allergic reactions in sensitive individuals. If you are handling large amounts of moldy grounds, it’s wise to wear a mask or wash your hands thoroughly afterward.
My wife is using it in the garden. I use dried pucks (they can stay OK for few weeks this way without any moulding, for picking malodours.