It's some kind of mold or maybe even algae, I think. Pretty sure if we could see into the depths of all our pots of bark medium, there's lots of different stuff like that growing down inside the pots and baskets of our orchids. You just can't keep them sterile and it wouldn't be healthy if you did.
We had sun for most of the day today, so don't worry, Lindsey the sun will be back! And the heat too.
