Gyalecta ulmi

This very rare crustiose lichen occurs on mosses and the shaded northern side of calcareous rocks, formerly on the bases of English and Wych Elm trees. The British Lichen Society has old records from Swaledale in the far North of the Yorkshire Dales National Park. The National Park Authority is planning a carefully targeted specialist survey of rare lichens on veteran trees with the aim of finding out its current status.

At risk?

The national population of this lichen declined due to the loss of Elms associated with the Dutch Elm disease in the 1970s. It is now a UK and local priority species for biodiversity action.

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The unfolding of Grass Wood throughout the year is a story of rich fulfilment. From 'Wharfedale' by Ella Pontefract & Marie Hartley

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