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 239619 10.11646/phytotaxa.589.3.1 130b35f1-f948-48f8-aa9d-c067985ce1fd 1179-3163 7776942

TABLE 3. Data on BM material for Pyrgodiscus armatus specimens illustrated herein (abbreviations: d = diameter, cd = central dome height, cdw = central dome width, sp = average spine length)

Figs	BM	MeasUrements (μm)
7,8	BM 46649! (Sturt A1588)	d= 85; cdw = 43; sp = 29
9, 10	BM 7333!	d= 78; cd = 26; sp = 29
11, 12	BM 7334!	d= 72; sp = 30
13–15	BM 7334!	d= 73; cd = 28; sp = 32
16–18	BM 57612! (Wynne Baxter 2985, Kitton)	d= 70; cd = 33
19, 20	BM Adams J3765! (Alfredo Truan, Sep [18]86)	d= 78; sp = 19
21–23	BM 46164! (Sturt A1101, Kitton)	d= 70; cd = 28; sp = 29