Growing on boulders in full sun
on concrete mortar
Seen growing luxuriantly on a native rock in the mixed oak woodland understory.
I'm almost positive this is Racomitrium canescens, or Roadside Rock Moss. It's very common, but I'd never IDed it before.
Found covering a 20 cm rock in full sun. Leaf length 2.5 mm.
A number of these moss tufts were seen growing on a large native rock. The characteristic size of most of these tufts was about two to three cm across.