From Fensome et al., 2019:
Spiniferites ramosus ssp. granomembranaceus (Davey and Williams, 1966a, p.37–38, pl.4, fig.4) Lentin and Williams, 1973, p.130. Holotype: Davey and Williams, 1966a, pl.4, fig.4; Bujak et al., 1980, pl.4, figs.10–11. Originally Hystrichosphaera ramosa var. granomembranacea, subsequently Spiniferites ramosus var. granomembranaceus, thirdly (and now) Spiniferites ramosus subsp. granomembranaceus. Lentin and Williams (1993, p.614) retained this taxon as Spiniferites ramosus subsp. granomembranaceus. Age: Early Eocene.

---------------------------------------------------------------------------------------------------

Locus typicus: Kent, England
Stratum typicum: Early Eocene

Original diagnosis: Davey and Williams, 1966, p. 37: Hystrichosphaera ramosa var. granomembranacea
A variety of H. ramosa (Ehrenberg) possessing a central body with a granular surface. Membranes well developed on plate boundaries particularly in cingular and polar regions.
Dimensions:
Holotype: diameter of central body 47 by 49 µm, length of processes up to 20 µm.
Range: diameter of central body 41.5-56 µm, length of processes up to 27 µm.

Affinities:
Davey and Williams, 1966, p. 38: Hystrichosphaera ramosa var. granomembranacea
This variety is similar to H. ramosa var. membranacea except that the surface of the central body is granular.