Identification notes
The classic habitat of this small, neat-looking Grimmia is on walls of sandstone or other hard, base-poor rock in hill districts. Its small, blackish cushions often have numerous erect capsules on long setae.
Under the microscope, it is one of only a few species that have thin-walled basal marginal leaf cells. Of these, only G. arenaria also has hyaline hair-points and capsules and as the latter are horizontal and held on a curved seta, it resembles G. pulvinata.
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