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Buellia subdisciformis (K+yellow-red), one of the most frequent lichens of siliceous rocky shores resembles a larger version of this very rare species. When searching for B. excelsa (K+ yellow, Pd-) it is best to spot test candidates with K. A squash of the disc should reveal the presence of numerous oil droplets; spores 11-15ųm long. In Ireland, it is known from the Mount Doughruagh area of Connemara, County Galway.
Original text submitted by Vince J. Giavarini