This is a crustose lichen with a scurfy-leprose thallus, bright to glaucous green in colour, becoming dirty grey. Apothecia are bright pink-orange to a piebald brown, 0.1-0.3 mm diam., occasional, semi-immersed, rarely becoming sessile.
Photo: P. Diederich
On very shaded, base-rich bark and inside old hollow trees, especially elm, ash and willow. Also very old oaks in sheltered wayside and woodland sites and by water.
Rare but widespread throughout Britain, also France, Denmark, Norway, Spain.
|Location||Grid Reference||Last Rec'd||Recorder||SSSI|
|Cards: Coed Cwm Cletwr||SN664919||1991||S.P. Chambers||Yes|
|Cards: Coed Cwm Cletwr||SN676917||2010||S.P. Chambers||Yes|
|Cards: Coed Nant Llolwen||SN589772||1993||S.P. Chambers||Yes|
|Cards: Coed Cwm Einion||SN691947||1994||S.P. Chambers||Yes|
|Cards: Coed Nant Paith, E of Nanteos||SN630785||1995||S.P. Chambers||No|
|Cards: Trawsgoed||SN667729||1997||S.P. Chambers||No|
|Cards: Coed Rhiwbren Fawr||SN473574||2010||S.P. Chambers & A.Seddon||No|
|Cards: Coedmor NNR||SN194436||1985||A. Orange||Yes|
|Mers: Coed Dolgoch Falls||SH652043||1992||S.P. Chambers||No|
These notes from Steve Chambers:
Coed Cwm Cletwr: With Agonimia allobata on decaying bark of Tilia cordata, alt 60m and On shaded damp bark on NE side of Fraxinus excelsior in gorge E of minor road bend at E end.