Brachythecium genus -- Brachytheciace
brachythecium moss (Brachythecium collinum) -- in April -- Arthur's Rock Trail, Lory State Park, Colorado
waterside feather moss (Brachythecium rivulare) -- in January -- Arthur's Rock Trail, Lory State Park, CO
velvet feather-moss (Brachythecium velutinum) -- in February -- Arthur's Rock Trail, Lory State Park, CO