Hystrichosphaeridium duplum subsp. duplum

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"subsp. duplum".  Autonym.  Holotype: White, 1842, pl.4, fig.12.  Name illegitimate: the species name is illegitimate.  Originally Hystrichosphaeridium palmatum subsp. palmatum (combination illegitimate), subsequently Hystrichosphaeridium duplum subsp. duplum (name illegitimate).  Age: Senonian. Parent: Hystrichosphaeridium duplum