tafod y ddaear coesyn garw

== Welsh == === Etymology === Literally, “rough stalk earthtongue”. === Noun === tafod y ddaear coesyn garw m (plural tafodau'r ddaear coesyn garw) deceptive earthtongue (Geoglossum fallax) === Mutation === === Further reading === Cymdeithas Edward Llwyd (2018), “Y Bywiadur”, in Llên natur‎[1], retrieved 16 August 2025.