The spores form pods and the next thing you know there is a duplicate of you standing there, avoid sphagnum at all costs, it is part of the alien takeover. /humor
I have next to zero experience with sphagnum, but I have bought several bags of dried long fibered sphagnum for my cps. I had left a little in wet pot that I usually mix the soil in. I had gone to San Francisco for 2 weeks . When I had returned, tiny amounts of it had started to grow. It was like it had come back from the dead. Kinda of what I hope will happen with some of the cps I lost in the nasty weather and animal issues.
It hasn't grown radically which some members will tell you to be careful of. Some say it can become overwhelming. I have not had that problem yet. Just some growths in areas that are kept damp. I am not sure on a scientfic level about sphagnum and cps, but I do notice that the cps in the wild like to grow in or near it. So there has to be some sort of symbiotic relationship there. So if cps in the wild like and grow in it, I will give it to mine.
Sincerely,
Brendhan