Polygonium nanus Appendix A

nanus (Deflandre, 1945a, p.62-63, pl.1, figs.5-7) Jacobson, 1978, p.297.  Holotype: Deflandre, 1945a, pl.1, figs.5-6.  Originally Hystrichosphaeridium brevispinosum var. nanus, subsequently Baltisphaeridium nanus (Appendix A), thirdly Baltisphaeridium brevispinosum var. nanus (combination not validly published, Appendix A), fourthly Micrhystridium nanus (Appendix A), fifthly (and now) Polygonium nanus, sixthly Solisphaeridium nanus (Appendix A).  Sarjeant and Stancliffe (1994, p.21) retained this species in Polygonium.  Taxonomic junior synonym: Baltisphaeridium brevispinosum var. wenlockense (subsequently Salopidium wenlockense) Downie, 1959, an acritarch taxon, according to Lister (1970, p.54).  N.I.A.  Age: Silurian.

Parent: Polygonium