- Ambitisporites sp.B
- Ambitisporites sp.B Rich.& Ioan.,1973
- Ambitisporites sp.C
- Ambitisporites sp.C1
- Ambitisporites tripapillatus
- Ambitisporites vavrdovae
- Ambitisporites warringtonii
- Amblisporites
- Amblygonocarpidites
- Amblygonocarpidites areolatus
- Amblygonocarpites areolatus
- Amblygonocarpus
- Amblygonocarpus andongensis
- Ambonosphaera
- Ambonosphaera bavarica
- Ambonosphaera calloviana
- Ambonosphaera delicata
- Ambonosphaera hemicavata
- Ambonosphaera jurassica
- Ambonosphaera sp
- Ambonosphaera sp.A
- Ambonosphaera sp.B
- Ambonosphaera sp.C
- Ambonosphaera staffinensis
- Ambonosphaera utera
- Ambrosia
- Ambrosia psilostachya
- Ambrosia sp
- Ambrosia sp. Grah.,1965
- Ambrosia sp. MacG.,1962
- Ambrosia sp. Will.,1975
- Ambrosia sp.1
- Amelanchier
- Amelanchier alnifolia
- Amelanchier couleeana
- Amelanchier sp
- Ameliaphycus
- Ameliaphycus croxfordii
- Amentiferae
- Amentiferae sp
- Amentogerdiopollenites
- Amentogerdiopollenites oligocenensis
- Amentoplexipollenites
- Amentoplexipollenites catahoulaensis
- Amentotaxus