Cladonia botrytes has never been found in Ireland. It’s likely it is here. However, its small size (about 5 mm high), its growth among other Cladonia species and its specific requirements have probably all contributed to its elusiveness. All Scottish specimens have been found on coniferous tree trunks exposed to direct sunlight for a short time of the day. Critically the exposed cut wood has not been chemically treated. You can report a sighting to info [at] lichens.ie (replace [at] with @).