What is "noeggerathiales"

Noeggerathiales is a now- extinct order of vascular plants. The geologic range of the order extends from the Upper Carboniferous to the Triassic. Due to gaps in the fossil record, the group is incompletely known and poorly defined, and their taxonomic status and position in the plant kingdom are uncertain. The Noeggerathiales have been proposed in the evolutionary scheme in two remotely related groups of vascular plants, the Pteropsida and the Sphenopsida.

Noeggerathiales have been previously linked to horsetails and ferns, but are currently believed to be progymnosperms.