Grimmia muehlenbeckii

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Identification notes

This large, blackish Grimmia was only confirmed as a British and Irish species in 2007 and it remains unfamiliar to many bryologists.

Although its large, dense cushions are conspicuous when growing on hard, south-facing rocks, it is essentially a microscope-only species. It’s especially fond of basic volcanic rocks, including dolerite, basalt and peridotite.

Clusters of spherical red-brown leaf gemmae have been reported from European specimens but are rare here.

To identify this species, you’ll need a modern key, and fortunately there are several available from the Resources pages of this website.

Distribution in Great Britain and Ireland

View distribution from the BBS Atlas 2014

Resources you may find useful

Porley, R.D. & Maier, E. 2007. Grimmia muehlenbeckii Schimp. in Britain and Ireland. Journal of Bryology 29: 188-193.

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

Bryophyte identification resources