Answer: Fungus is part of the natural decay process and will appear when conditions are favorable, often during spells of wet weather or where mulch is watered often. Usually what we see are the fruiting bodies (toadstools or other sometimes odd looking masses on the surface) and sometimes we see stringy growths through the mulch below the surface. This helps break down the mulch so it can feed the soil on an ongoing basis so it is actually not a bad thing at all to have appear. It is not harmful to the plants although it can be ugly. You can try raking the mulch to air it out or if it is a surface-growing patch just remove it with a shovel. Once conditions are no longer favorable it should go away on its own.
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