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This lichen colonises the grain of weathered wood and timber like a rash of boat-shaped lines. It looks like an ironed-flat Opegrapha but the colour of the disc is brown; this makes it distinctive and easy to name in the field. The species is not common owing to the lack of wooden fencing in the Irish countryside (because of the rapid rate of decay and therefore replacement expense) rather than its genuine rarity. Chemical reactions are negative.
Original text submitted by Vince J. Giavarini