Hystrichosphaeridium tubiferum var. brevispinum

"var. brevispinum" Davey and Williams, 1966b, p.58, pl.10, fig.10.  Emendation: Marheinecke, 1992, p.61, as Hystrichosphaeridium proprium subsp. brevispinum.  Holotype: Davey and Williams, 1966b, pl.10, fig.10; Bujak et al., 1980, pl.8, figs.10-12; Fauconnier and Masure, 2004, pl.47, figs.1-4.  NOW Hystrichosphaeridium tubiferum subsp. brevispinum.  Originally Hystrichosphaeridium tubiferum var. brevispinum, subsequently (and now) Hystrichosphaeridium tubiferum subsp. brevispinum, thirdly Hystrichosphaeridium proprium subsp. brevispinum.  Taxonomic senior synonym: Micrhystridium (as Dapsilidinium?, now Litosphaeridium) fucosum, according to Below (1982c, p.29) - however, Lentin and Williams (1993, p.336) retained Hystrichosphaeridium tubiferum subsp. brevispinum.  Age: Early Eocene.Hystrichosphaeridium tubiferum