Known only from County Antrim, this minute lichen, which is similar in size and colour to M. bauschiana (described elsewhere), is gaining a reputation as an early coloniser of discarded wood and stony waste in habitats which have undergone some local disturbance. This species has discs with a rim (exciple) unlike in M. bauchiana.

Key characteristics

• Like M. bauchiana, but has a disc exciple with distinctive olive-green edge
• A pioneer lichen of stony waste and wood fragments; spores simple.

Original text submitted by Vince J. Giavarini