The horsetails
This group is represented much better than the one of the clubmosses. Leaves, spore cones and parts of the trunks are rather common. The herbaceous genus Sphenophyllum occurs with only one species, but it does in great numbers.
Trunks: Calamites
Leaflets: Annularia and
Asterophyllites
Spore cones: Macrostachya and
Calamostachys
Herbaceous horsetail:
Sphenophyllum
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