Description: Similar to M. confusa and M. atlantica (both described elsewhere), M. wallrothii is an Arthopyrenia lookalike species differing in its brown-coloured spores. It can be told from its two near relatives by the virtual absence of a thallus, the conspicuous fringe of cells around the discs and different host tree (birch).

Key Identification Features:

• Thallus inapparent, discs with a halo-like fringe of cells plainly visible
• Spores brown in the ascus, but externally very like a species of Arthopyrenia or Leptorhaphis; on birch.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Mycomicrothelia wallrothii at iNaturalist World Species Observations database.