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SEM micrographs of pollen grains (A, C, E) and ornamentation of exine (B, D, F). (A, B) Polyalthiopsis nigra, spheroidal monad (A) with rugulate-verrucate ornamentation (B); (C, D) Polyalthiopsis xui, spheroidal monad (C) with echinate ornamentation (D); (E, F) Polyalthiopsis chinensis, spheroidal monad (E) with scabrate ornamentation (F). Scale bars: 5 μm.
