Description: Foliose lichen, attached at the centre by an umbilicus. Thick-lobed, the edges often finely divided and distorted, smooth glossy chestnut above with a black felt of protruding, branched hairs below. Discs are uncommon. Mountain rocks: north-west and eastern Ireland.

Key Identification Features:

• Lower side densely felted with short, black rhizinae
• Upper surface dark chestnut brown, smooth and glossy.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Umbilicaria polyrrhiza at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Umbilicaria polyrrhiza at iNaturalist World Species Observations database.