tafod y ddaear plaen

== Welsh == === Noun === tafod y ddaear plaen m (plural tafodau'r ddaear plaen) plain earthtongue (Geoglossum umbratile) === Mutation === === Further reading === Cymdeithas Edward Llwyd (2018), “Y Bywiadur”, in Llên natur‎[1], retrieved 16 August 2025.