Hamatophyton verticillatum (Gu et Zhi)
Sphenophyta
Devonian, China
Size: 8cm
Sphenophyllum oblongifolium (Germar et Kaulfuss)
Sphenophyta, Equisetaceae
Carboniferous, China
Size: 9cm
Annularia stellata (Schlotheim)
Sphenophyta, Equisetaceae
Carboniferous, China
Size: 7cm
Calamites cf. craciatus Sternberg
Sphenophyta, Equisetaceae
Carboniferous, China
Size: 13cm
Calamites sp.
Sphenophyta, Equisetaceae
Upper Carboniferous, Xinjiang, China
Size: 16x13cm
Lobatannularia
Sphenophyta, Equisetaceae
Upper Permian, Henan, China
Tingia carbonica (Schenk)
Noeggerathiales
Carboniferous, China
Size: 13cm