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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
|Simms, M. J., (2016). Buellia excelsa (Leight.) A.L.Sm.. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=18282 Accessed on 2016-06-30.