mystery moss in Plantasia

I'm assuming this is an alien, but must confess that I've not yet tried keying it out, so forgive me if it's something obvious that I'm missing. It's reminiscent of Calyptrochaeta apiculata, but clearly isn't that. C. brownii looks a better fit but that's not quite right either so I'm throwing it open to suggestions before I spend more time looking. Here are some phone pics from the location and bits under the m'scope. I'll take a few tidier images tomorrow.