This epiphytic member of the genus has recently been found in Ireland (Westmeath). Like D. alboatrum (described elsewhere), it has submuriform spores but unlike that species, possesses a conspicuous rim or exciple around the large flat disc. Examination of the spores shows that longitudinal divisions occur immediately to either side of the septum. Smooth nutrient-rich bark.

Key characteristics

• On smooth nutrient-rich bark such as ash, poplar, willow; slightly frosted disc with distinctive exciple not unlike that of Buellia disciformis
• Spores with longitudinal divisions either side of the septum.

Original text submitted by Vince J. Giavarini