Williams, D. M., Sims, P. A. and Ashworth, M. P. (2026) “Notes on the diatom collection of the Natural History Museum, London (BM) X: Roper’s species of Biddulphia (Bacillariophyta)”, Phytotaxa. Auckland, New Zealand, 755(2), pp. 121–153. doi: 10.11646/phytotaxa.755.2.1.