A veritable jungle of mosses, the bright green of a patch of a Bryum species, most likely the silvery bryum. The online NZ Enyclopedia has this to say:
Silvery bryum looks silvery because the cells of the upper third of its leaves die and lose their chlorophyll. Their skeletal remains are white and shiny, especially when dry. The dead tips act like a layer of sunscreen, protecting the still-living lower two-thirds of the leaves from damage by ultraviolet radiation. When the dead leaf tips are dampened by rain, they turn glass-like, allowing light to penetrate the moss cushion.
This patch of Bryum brightens up a a large colony of our old favourite Tortula muralis.
