van der Wiel (1982): Spores light or dark brown, ovoid, onecelled, smooth-walled, 20-37 (27) × 16-32 (23) µm with an apical pore of about 1 µm in diameter. Walls relatively thick.
van der Wiel AM (1982) A palaecological study of a section from the foot of the Hazendonk (Zuid-Holland), based on the analysis of pollen, spores and macroscopic remains. Rev. Palaeobot. Palynol. 38:35-90.