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
