Hystrichosphaeridium brevispinosum var. nanus

"var. nanus" Deflandre, 1945a, p.62-63, pl.1, figs.5-7.  Holotype: Deflandre, 1945a, pl.1, figs.5-6.  NOW Polygonium nanus (Appendix A).  Originally Hystrichosphaeridium brevispinosum var. nanus, subsequently Baltisphaeridium brevispinosum var. nanus (combination not validly published; Appendix A), thirdly Baltisphaeridium nanus (Appendix A), fourthly Micrhystridium nanus (Appendix A), fifthly (and now) Polygonium nanus (Appendix A), sixthly Solisphaeridium nanus (Appendix A).  Taxonomic junior synonym: Baltisphaeridium brevispinosum var. wenlockense (subsequently Salopidium wenlockense) Downie, 1959, an acritarch taxon, according to Lister (1970, p.54).  This name was not validly published in Deflandre (1942, fig.1 - p.476), who did not give a description.  N.I.A.  Age: Silurian.

Parent: Hystrichosphaeridium brevispinosum