United States

In the last couple of weeks I have found an unusual growth on my wood chips, only one got on the leaves of a plant, o/w they have been contained to the mulch.
When dry it is a crusty white, when I found the first clump, I was watering, so I sprayed water on it and it appeared not to be water soluble. It rose up into a tiny particulate matter, quite like smoke. Underneath the white layer that was dry, it was yellow in color. Now the other day I found a clump that was still wet and it was yellow in color in the non-dry state. I have found about 7 piles of this throughout my beds.
Any ideas/and or what I should do and if it is of concern?

• 29 Aug, 2008