The pollen grains of Baseonema and Batesanthus are united
in tetrads, with the grains arranged rhomboidally (Fig. 1a) or
decussately (Fig. 1b, c, d). Although rhomboidally arranged
grains are present, the most common arrangement is decussate in
both genera. The exine is smooth. The pores are round and
restricted to the junction area of adjacent grains. In Baseonema
individual tetrad grains mostly have eight to ten pores (Fig. 1b),
although some grains may have six pores. The length of the
decussate tetrads ranged between 52.1 and 63.2 μm (x=57±
2.5 μm), and the width between 51.2 and 60.5 μm (x=55.4±
2.5 μm). In Batesanthus individual tetrad grains have four to six
pores (Fig. 1c, d). In B. pseudopalpus the length of decussate