In the UK, it occurs in montane habitats in England, Wales and Scotland at heights of over 200 metres, thriving on decomposing bryophytes (such as Marsupella emarginata) on base-rich soils.

[2] The species is classified as near threatened in the UK and receives protection under the Wildlife and Countryside Act 1981.

[2][3][4] It is known from three sites in Wales – Cwm Idwal, Cwm Glas Mawr and Llyn Glas – and one site in Cumbria, in England.

In Ireland, it is found on metamorphosed limestone in County Donegal.

[2] Jamesiella scotica is a crustose lichen with a varnish-like thallus that grows to a diameter of 1.5 cm.