rusty looking things

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back in the days when I had a few Maudiae type hybrids, I saw this a lot - brown rusty marks on the undersides of the leaves. What is it? is it relatively benign? or not? The person who posted these photos is a gesneriad buddy - she just told me that she likes these slippers but can't seem to keep them happy, and wants some tips. (from me :rollhappy: )

sorry - can't embed the image.... I think the next photo in the "Misc shots for discussion" set is the same plant.
okay, so I posted about this before she explained that she thinks it's well water.....