From Fensome et al., 2019:

Pulvinosphaeridium, Eisenack, 1954a, p.210.
Emendation: Sarjeant and Stancliffe, 1994, p.52.
Acritarch genus.
For synonymy see Fensome et al. (1990, p.433).
Type: Eisenack, 1954a, pl.1, fig.10, as Pulvinosphaeridium pulvinellum.