Description: Large striking foliose lichen forming rounded rosettes of wavy lobes — dark brown when wet, greener when dry — crammed with abundant, tiny, leaf-like folioles; lower surface with a thin fur of tomentum. The discs are red-brown and unmistakable with abundant folioles around the exciple (rim), like petals round a chrysanthemum head. It occurs on mossy tree trunks or fallen trees in moist woodlands, often by loughs. In Ireland, it is present in the south and west only.

Key Identification Features:

• Thallus dark brown, thinly furry below, leafy to 10cm or more, of wavy rosettes crisped with folioles
• Discs red-brown ringed with folioles; mossy trees by waterbodies.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Leptogium burgessii at iNaturalist World Species Observations database.