I had previously googled 'Luminous moss' and not found any other. So learning about Mittenia plumula (Mitt.) Lindb. is a lovely surprise.
I hadn’t, till I read this paper, that it was only the protonema that was luminous.
“Schistostega is not known outside Holarctic, where it is more common in the regions dominated by coniferous forests. This is a well-known species due to its peculiar feather-like sterile leaves and persistent luminous protonema.”
Postscript. Zoochory, in the title of the paper cited, means “the dispersal of plant spores or seeds by animals”.
This is the youtube short video I started this discussion with, and I will send an email to Thirlmere NP with a link to our ispot forum.