Description: Known only from south Kerry and west Donegal, H. speciosa is very like its more frequent cousin H. obscurata (formerly H. japonica). Separating the two requires examination of the underside. In H. speciosa this is smooth and shiny, white to tan coloured (not yellow-spotted on a web of hyphae).

Key Identification Features:

• Lower surface of thallus with an outer layer or cortex: white or tan
• Lower surface without yellow or orange spotting or a web of fibrous hyphae.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Heterodermia speciosa at iNaturalist World Species Observations database.