taxonID	type	description	language	source
03F87E73FFECFFE9FF5BFE9FE6631932.taxon	materials_examined	In 1951, Pierre Fusey (1921 – 1999) described a small-celled araphid taxon as Fragilaria construens [var. binodis] f. robusta Fusey (Fusey 1951: 34, pl. 1: fig. 2) from a small pond (Étang du Pellinec) near the commune of Corlay, Côtes-d'Armor Départment, Brittany, France. The taxon was first raised to species level by Manguin as Fragilaria robusta (Fusey) Manguin (Manguin 1954: 14, pl. 1: fig. 6) and later transferred to the genus Pseudostaurosira as P. robusta (Fusey) D. M. Williams & Round (1987: 278). Although the original Fusey material was not examined for the current study, from a comparison of the drawing in Fusey (1951: pl. 1: fig. 2) with the F. undulata valves in Rabenhorst sample 1441, it is clear that both taxa are conspecific, making the former a junior heterotypic synonym of F. undulata C. E. Cramer. However, although validly published, Cramer’s F. undulata is an illegitimate name as in 1835, another species bearing the name Fragilaria undulata was described by August K. J. Corda (1809 – 1849), a Czech mycologist and botanist working as curator of the Zoology division at the Czech National Museum. Fragilaria undulata Corda (Corda 1835: 207, pl. IV: figs, 39, 40) described a colony-forming diatom species from a sample collected in the thermal waters of Carlsbad (Karlovy Vary, Czech Republic). Attempts to find the Corda material were unsuccessful (O. Šída, Herbarium, National Museum Prague, pers. comm.). Judging from the drawing in Corda (1835) it is clear that both taxa are not even congeneric. Also, Ehrenberg (1854: 108) included the name F. undulata but this is considered a nomen nudum since only a name was mentioned lacking a description or an illustration (Art. 38.1). Despite this illegitimate name, it is possible to validly and legitimately transfer F. undulata C. E. Cramer to the genus Pseudostaurosira as a replacement name (Art. 6.11) as P. undulata Van de Vijver & Kusber, nom. nov. The slide made from Rabenhorst sample 1441, kept in BR (Meise Botanic Garden, Belgium) is designated as lectotype for P. undulata.	en	Vijver, E. Cramer Bart Van de (2022): Typification and transfer of Fragilaria undulata C. E. Cramer to the genus Pseudostaurosira (Staurosiraceae, Bacillariophyta) with some notes on the diatom species described by Carl E. Cramer. Notulae Algarum 225: 1-5, DOI: 10.5281/zenodo.16652632
03F87E73FFECFFEBFF5BFA9AE3341E49.taxon	description	Lectotype (here designated): BR - 4683, slide prepared from Rabenhorst sample 1441 (exsiccata Algen Sachens & Europa’s) in BR (Meise Botanic Garden, Belgium). The lectotype is represented here by Fig. 6. Duplicates of the Rabenhorst material No. 1441 and Wartmann & Schenk as sample 233 are found in numerous herbaria (e. g., Stafleu & Cowan 1983: 465; 1988: 93). Registration: https: // www. phycobank. org / 103020 Synonyms: Fragilaria pseudoconstruens var. bigibba Marciniak (Marciniak 1982), Staurosira robusta (Fusey) Lange-Bertalot (in Krammer & Lange-Bertalot 2000), Pseudostaurosira robusta (Fusey) D. M. Williams & Round (Williams & Round 1987), Fragilaria construens [var. binodis] f. robusta Fusey (1951, 34, pl. 1: fig. 2) Description: Frustules rectangular in girdle view, connected to each other forming ribbon-like colonies using spatulate linking spines (Figs 3, 16). Valves linear, bigibbous with a clear central constriction. Apices protracted, rostrate. Valve dimensions (n = 30): length 10 – 19 µm, width (largest width at undulations) 4 – 5 µm, width (at constriction) 2.5 – 3.0 µm. Sternum broad, linear to linear lanceolate. Central area absent. Striae uniseriate, composed of 1 – 3 large, rounded to transapically elongated, marginal areolae, internally closed by volae, 16 – 17 in 10 µm (Figs 18, 19, 20). Rimoportulae absent. Apical pore field small, composed of a few small pores at the apices (Fig. 18). Mantle plaques clearly visible at the mantle edge (Fig. 16). Girdle bands very narrow, plain (Figs 16, 21). Occasionally, deformed valves present in the population showing apical asymmetry (Figs 14, 15). The discrepancy in valve length between the observed value (10 – 19 µm) and the reported length in Cramer (1863) is striking. However, analysis of the original material revealed no valves combining the morphology and the given measurement, indicating that the observed length range most likely is the correct one. The authors wish to thank: Prof. Dr J. Neustupa and Dr O. Šída for their search for the original Corda material in Prague (Czech Republic), and Dr David M. Williams for his valuable comments on the Cramer material and the morphology of the discussed species. Cleve, P. T. (1894). Synopsis of the naviculoid diatoms. Part I. Kongliga Svenska Vetenskapsakademiens Handlingar Series 4 26 (2): 1 – 194, 5 pls. Corda, A. J. C. (1835). Observations sur les animalcules microscopiques, qu'on trouve auprès des eaux thermales de Carlsbad. Almanach de Carlsbad 5: 166 – 211, pls I-VI. Cramer, C. E. (1863). Algologische Notizien. Hedwigia 11: 61 – 66. Cramer, C. E. (1869 ' 1868 '). Ueber einige Meteorstaubfälle und über den Saharasand. Schweizerische meteorologische Beobachtungen 5: [vii] - xviii, pls I, II. De Toni, G. B. (1892). Sylloge algarum omnium hucusque cognitarum. Vol. II. Bacillarieae; sectio II. Pseudoraphideae. Typis Seminarrii, Patavii., pp. 491 – 817. Ehrenberg, C. G. (1854). Mikrogeologie. Das Erden und Felsen schaffende Wirken des unsichtbar kleinen selbstständigen Lebens auf der Erde. pp. 1 – 374. Leipzig: Verlag von Leopold Voss. Fusey, P. (1951). Contribution à la flore algologique de Bretagne. Diatomées de la Région de Corlay (Côtes-du-Nord). Bulletin de Microscopie Appliquée, Paris, 2 nd series 1 (2): 31 – 50. Krammer, K. & Lange-Bertalot, H. (2000). Bacillariophyceae, 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. In: Süsswasserflora von Mitteleuropa. Band 2 / 3 (ed. 2). (Ettl, H., Gerloff, J. Heynig, H. & Mollenhauer, D. Eds), pp. 1 – 599. Heidelberg: Spektrum Akademischer Verlag. Manguin, E. (1954). Contribution à la connaissance biologique des boues lacustres du Lac Pavin (Puy-de-Dôme). Annales de l'Ecole Nationale des Eaux et Forêts et de la Station de Recherches et Experiences 14 (1): 1 – 19, 3 pls, 1 table. Marciniak, B. (1982). Late glacial and Holocene new diatoms from a glacial lake Przedni Staw in the Piec Stawów Polskich Valley, Polish Tatra Mts. Acta Geologica, Academiae Scientiarum Hungariacae 25 (1 – 2): 161 – 171. Rabenhorst, L. (1863). Die Algen Europa's. Decas 145 – 146. Stafleu, F. A. & Cowan, R. S. (1983). Taxonomic literature IV: P-Sak (2 nd ed.). Utrecht, Antwerpen: Bohn, Scheltema & Holkema; The Hague, Boston: dr. W. Junk Publishers. 1214 pp. Stafleu, F. A. & Cowan, R. S. (1988). Taxonomic literature VII: W-Z (2 nd ed.). Utrecht, Antwerpen: Bohn, Scheltema & Holkema; The Hague, Boston: dr. W. Junk Publishers. 653 pp. Sypniewski, F. (1860). Okrzemki (Diatomaceae) okolic Poznania wraz, z krótka charakterystyka wszystkich rodzajów okrzemek w wodach słodkich: według analitycznej metody. Roczniki Towarzystwa przyjaciół NAUK Poznańskiego 1: 493 - 583, 5 pls. Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W. - H., Li, D. - Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G. F., editors (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile, Vol. 159. pp. [i] - xxxviii, 1 – 253. Glashütten: Koeltz Botanical Books. Wartmann, F. B. & Schenk, B. (1862 – 1882). Schweizerische Kryptogamen unter Mitwirkung mehrerer Botaniker. Centuries I – XI, fascicles I – XVIII, numbers 1 – 900. Sankt Gallen (Scheitlin & Zollikofer), Hottingen. Wartmann, F. B. & Schenk, B. (1864). Schweizerische Kryptogamen. St. Gallen. 1863. Fasc. V, VI, VII und VIII. Nr. 201 – 400. Hedwigia 4: 58 – 60. Williams, D. M. & Round, F. E. (1987). Revision of the genus Fragilaria. Diatom Research 2: 267 – 288, 58 figs.	en	Vijver, E. Cramer Bart Van de (2022): Typification and transfer of Fragilaria undulata C. E. Cramer to the genus Pseudostaurosira (Staurosiraceae, Bacillariophyta) with some notes on the diatom species described by Carl E. Cramer. Notulae Algarum 225: 1-5, DOI: 10.5281/zenodo.16652632
