†family Cooksoniaceae
Parent taxon: Rhyniophyta according to P. C. Gensel 1976
Sister taxa: Rhyniales, Dutoitea
Subtaxa: Renalia
Distribution:
• Devonian of Canada (1: Quebec collection), United States (1: Wyoming)
• Silurian of the United Kingdom (1)
Total: 3 collections each including a single occurrence