Description: This species is confined to the soft lignum of conifer and birch stumps. Like M. misella it has an immersed thallus which is invisible from above or is present only as a thin grey-green stain from which numerous black, stalked pycnidia arise. Small, black globose or wart-like discs (with purple-brown, K+ green pigment — seen in a squash) are sometimes present. A single record.

Key Identification Features:

• It is a species of soft spongy lignum of conifers and birch with small, black stalked pycnidia
• Purple-brown, K+ green pigment present both in the discs and the pycnidial tissues.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Micarea nigella at iNaturalist World Species Observations database.