Studies on type material from Kützing’s diatom collection VI: The identity of Diatoma liber Suhr (1831) Author Williams, David M. text Phytotaxa 2021 2021-12-17 528 3 215 223 journal article 2891 10.11646/phytotaxa.528.3.6 93a0ef9f-16d5-4e83-9dd1-124f985f2085 1179-3163 5788164 2. Biddulphia septemlocularis Kützing (1844 , p. 138) Kützing described Biddulphia septemlocularis Kützing (1844 , p. 138, pl. 19, fig. II, 1, 2) also from Canary Island material (“Unter Algen von den canarischen Inseln”). The alternative name ‘ septemcostata ’ was used in Eulenstein’s Catalogue of Kützing’s collection, this name being found only in the herbarium; there is also the additional unpublished name ‘ Isthmosira [ Isthmia ] canariensis ’. Eulenstein’s Catalogue indicates ‘Kützing 823’ (BM 19390, “Ins Canar.”) was also the source for the original material of Biddulphia septemlocularis . Inspection of the mica for ‘Kützing 823’ reveals only a few complete frustules so no SEM study was attempted. The images on which this description is based are from BM 19390 (‘Kützing 823’) ( Figs 2–6 ). Inspection of BM 19343 (‘Kützing 766’) yielded no whole specimens of Diatoma liber , the sample being dominated by Grammatophora marina (Lyngbye) Kützing (1844 , p. 128, pl. 17, fig. XXIV, 1–6, pl. 18, fig. I, 1–5). The specimens figured are all confirmed as a species of Biddulphia .