ɪn sˌʌm dʒˈɛnɚɹə ˈiː.dʒˈiː. lˈɪθəkˌɑːɹpəs, kwˈɜːkəs, ɪɾ ˈoʊnli pˈɑːɹtli ɛŋklˈoʊzᵻz ðə sˈɪŋɡəl nˈʌt, wˌaɪl ɪn ˈʌðɚz ˈiː.dʒˈiː. kæstˈeɪniə, fˈæɡəs, ɪt fˈʊli ɛŋklˈoʊzᵻz ðə tˈuː ɔːɹ mˈoːɹ nˈʌts, ænd splˈɪts ˈoʊpən æt mətʃˈʊɹɹᵻɾi ˌɪntʊ fˈoːɹ vˈælvz tə ɹᵻlˈiːs ðə nˈʌts.
In some genera (e.g. Lithocarpus, Quercus), it only partly encloses the single nut, while in others (e.g. Castanea, Fagus), it fully encloses the two or more nuts, and splits open at maturity into four valves to release the nuts.