Notes on the diatom collection of the Natural History Museum, London (BM) VII: An account of some original specimens of Pyrgodiscus (Bacillariophyta) with notes on Stephanogonia (Bacillariophyta) Author Williams, David M. 0000-0002-0584-307X d. m. williams @ nhm. ac. uk; https: // orcid. org / 0000 - 0002 - 0584 - 307 X d.m.williams@nhm.ac.uk Author Sims, Pat A. 0000-0002-0214-8303 p. sims @ nhm. ac. uk; https: // orcid. org / 0000 - 0002 - 0214 - 8303 p.sims@nhm.ac.uk text Phytotaxa 2023 2023-03-28 589 3 213 229 http://dx.doi.org/10.11646/phytotaxa.589.3.1 journal article 10.11646/phytotaxa.589.3.1 1179-3163 7776942 Pseudopodosira calyciflos (Tempère & Brun in Brun & Tempère) Kanaya 1963: 24 TYPE LOCALITY :— Limestone clay from Yedo ( Tokyo ), Japan ( holotype : Brun & Tempère 1889 : pl. 4, fig. 11b – specimen in pl. 4, fig. 11a “was included as pertaining to a material found alive in the Sandwich Islands (Hawaiian Islands)” ( Sar et al. 2017: 250 ). Basionym: Porodiscus calyciflos Tempère & Brun in Brun & Tempère 1889: 50 , pl. 4, fig. 11b Synonym: Pyrgodiscus calyciflos (Tempère & Brun in Brun & Tempère) De Toni 1894: 1011 TYPE :— JAPAN , “Yedo [ Tokyo ] (Miocene)”, holotype : illustration in Brun & Tempère (1889 : pl. 4, fig. 11b, see Sar et al. 2017: 247 , 250). MATERIAL EXAMINED: HAWAII , BM 60030! (“Sandwich Is. | Pyrgodiscus calyciflos | Wynne Baxter 6941”, Tempère slide), BM Adams F1043! (“Sandwich | J. Tempère) JAPAN , BM 62150! (“Fossil Marin | Senday, Japan | E. Thum ex Baker”);