''Haplostigma'' is a genus of arborescent lycopodiopsid, found only in the early part of the Middle

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

References

Prehistoric lycophyte genera Devonian plants {{devonian-plant-stub