Tafod yr hydd

Mae Bethan yn dweud hanes y rhedyn sy’n hen, hen blanhigion…

Hart’s tongue Phyllitis scolopendrium Mae’r Hydref wedi cyrraedd ac mae’r tyfiant yn y gwrychoedd a’r cloddiau yn marw’n ara’ deg. Ydych chi wedi sylwi ar y rhedyn sy’n dechrau dod yn fwy amlwg y dyddiau yma? Mae rhedyn yn hen, hen blanhigion. Maen nhw wedi bod ar y ddaear ers tua 400 miliwn o flynyddoedd. Gwnaethon nhw addasu i fyw ar y tir drwy ddatblygu gwreiddiau er mwyn iddyn nhw fedru tynnu dŵr o’r pridd. Roedd y rhedyn yn gallu symud maeth a dŵr mewn gwythiennau cryf y tu mewn i’r planhigyn. Roedd hyn yn gwneud y coesyn yn stiff. Dyma sut mae’n gallu sefyll i fyny’n syth. Roedd rhai o’r rhedyn cyntaf wedi tyfu’n goed tal, hardd. Geiriau gwrychoedd – hedges yn ara’ deg = gan bwyll – slowly amlwg – evident/easily seen addasu – to adapt gwreiddiau…

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Lingo Newydd (Digital) - 1 Issue, October / November 2022 - Issue 140

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