van Geel 1978: Spores ellipsoidal, 14-18(-21) X 11-14 μm, inclusive of a terminal, 1-3(-6) μm long, about 2-4 μm wide protuberance. Most of the Type 90 microfossils with several, 0.5 μm wide pores scattered over the surface.
van Geel B (1978) A palaeoecological study of Holocene peat bog sections in Germany and the Netherlands, based on the analysis of pollen, spores and macro- and microscopic remains of fungi, algae cormophytes and anymals. Rev. Palaeobot. Palynol. 25:1-120.