Order: Pyrenulales       Family: Monoblastiaceae Species: Anisomeridium polypori Growth type crustose. Identification confirmed by B. Coppins. Photos: On Ash trunk. Gougane Barra, Co. Cork, SW Ireland. The thin, inconspicuous thallus is whitish or pale grey-green. Perithecia 0.15-0.25mm, few or often absent. Small black pycnidia are usually abundant, with nipple-like or peg-like tips. Conical macropycnidia are most frequent, conical with ostilar neck and extruding a white tendril. Ascospores 1-3 septate, 12-16 x 5-7 µm. Common but probably under-recorded on rough-barked deciduous trees, especially Elder and Elm, in humid woodland. Also on shaded rock, damp pebbles and bone fragments. Tolerant of deep shade and moderate pollution. Chemical reactions negative. Similar: A. biforme. Perithecia, 0.3-0.4mm, ascospores 1-septate.

Anisomeridium polypori February 2010