Grimmia donniana

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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.

Read the Field Guide account

Distribution in Great Britain and Ireland

View distribution from the BBS Atlas 2014

Resources you may find useful

The Bryophyte identification page under Resources contains additional information on the genus Grimmia.

Bryophyte identification resources

Similar Species

Could be mistaken for many other species of Grimmia, however the usually abundant, distinctive capsules are a characteristic and useful aid to identification.