It sounds to me like some kind of mite. Spider mites usually are
brown or reddish, but there likely are white ones because there
are a zillion species.

Few insecticides work real well on mites, but a heavy spray of
water into the foliage usually will keep them in control.
Indoors is tough, though.

You probably will need to water a bit more than "misting" will
supply, but watering from a sprinkler can from above is MUCH
better than submerging it -- though submerging is a good way to
deliver fertilizer. Just be sure the soil isn't soggy. Let it
get almost dry before you water again. Since it is hard to keep
moss alive indoors, I suspect your soil is too wet.

I can't recall . . . is this an elm or a juniper? Or something
else.

Good luck.

Jim Lewis - - Tallahassee, FL - The phrase
'sustainable growth' is an oxymoron. - Stephen Viederman

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