Baltisphaeridium polytrichum Appendix A

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"polytrichum" (Valensi, 1947, p.818; text-fig.4) Downie and Sarjeant, 1965, p.95.  Holotype: Valensi, 1947, text-fig.4; Fauconnier and Masure, 2004, pl.24, figs.1–6.  NOW Impletosphaeridium? Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Impletosphaeridium, fifthly Downiesphaeridium, sixthly (and now) Impletosphaeridium?.  Taxonomic junior synonym: Cleistosphaeridium (as Downiesphaeridium) polyacanthum, according to Masure in Fauconnier and Masure (2004, p.196).  This combination was not validly published in Sarjeant (1959, p.339 and 1962, p.487), since that author did not fully reference the basionym.  Age: late Bajocian.

Parent: Baltisphaeridium_Appendix A