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weird brown stuff on soil

Hello Indoor Gardeners,

I'm new to the list and hope this hasn't been discussed before, but after
exploring the web and several books, I thought I'd write and ask for help.
I'm stumped!

I recently repotted, using potting soil, two small houseplant clippings: a
schefflia (sp?) and a philodendron.

Two weeks later, I've got a brown substance on the soil looking like
patches of mold, except they are brown. I haven't overwatered, and the air
is quite dry in this room, but these plants never seem to mind. On the
schefflia it looks like there are a few patches of brown also, and a few
leaves look like there are a bite taken out of them.

Is this scale?

The "infestation" is across the entire surface of the soil in both plants.
Any ideas?
Thanks!
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