Manuscript, 'On the functions and structure of the rostellum of Listera ovata' by J D [Joseph Dalton] Hooker Subject: Botany Published in Philosophical Transactions as 'On the functions and structure of the rostellum of listera ovata'. Received and read by the Royal Society on 15 June 1854. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 7, 1856. [1854]