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(Map updated: 11 August 2009)

This crustose epiphyte grows on the smooth bark of mature trees (especially ash) in the sheltered woodlands of the west. The thin, olive brown to dark brown thallus has conical discs (perithecia) scattered among smaller pycnidia giving the appearance of little and large dots. Under the microscope, the spores are one-septate but are easily broken, separating into part-spores. Local and scattered in northern and western Ireland.

Key characteristics

• Thallus thin, brown, with the discs (perithecia) scattered among smaller, more numerous pycnidia
• Spores one-sepate, delicate, easily damaged; on ash, local western Ireland.

Original text submitted by Vince J. Giavarini