Referee's report by Charles James Fox Bunbury, on a paper 'On the organization of the fossil plants of the coal-measures. Part IV - Dictyoxlon, lyginodendron, and heterangium' by William Crawford Williamson Recommended for publication in Philosophical Transactions. It is a sequel to previous papers on the subject and 'consists, like them, of most careful, minute and elaborate descriptions of the microscopic structure of the plants referred to'. Subject: Botany [Published in Philosophical Transactions, 1873]. 18 February 1873