plantladylin: It didn't occur to me that it could be in the soil! I used a bagged potting mix that I had sitting around for a few months. I used the fern-like moss in another terrarium and there's nothing wrong with it, but I used a different soil in that one. I'm going to take your advice and wash off what I can and start over with a new potting mix. But now I worry because I used that soil in a few other plants I repotted over the weekend (all succulents). Also, when I rework the terrarium I'm going to switch out the succulent with a fern. Thank you so much for your insight!
greene: I bought the moss and the soil. The moss wasn't named by the seller, but I believe it was two different kinds of fern moss, a couple big chunks of reindeer moss, a moss I'm unfamiliar with, and some black lichen. When I rework the terrarium I'm going to keep this one uncovered now and then.
Thank you both so much!
