Hystrichosphaeridium palmatum subsp. parvum
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"subsp. parvum" (Rozen, 1965, p.303-304, pl.4, fig.6; text-fig.13) Lentin and Williams, 1981, p.144. Holotype: Rozen, 1965, pl.4, fig.6; text-fig.13. Combination illegitimate: species name illegitimate. NOW Hystrichosphaeridium recurvatum subsp. parvum. Originally Hystrichosphaeridium recurvatum var. parvum, subsequently (and now) Hystrichosphaeridium recurvatum subsp. parvum, thirdly Hystrichosphaeridium palmatum subsp. parvum (combination illegitimate), fourthly (and now) Hystrichosphaeridium duplum subsp. parvum (combination illegitimate). Age: Late Eocene.
Parent: Hystrichosphaeridium palmatum_White 1842