Subfamily Blechnoideae Gasper et al. 2016 (fern)
Parent taxon: Blechnaceae according to PPG. I 2016
Sister taxa: Leptolepidites, Midlandia, Peromonolites, Stenochlaenoideae, Woodwardioideae
Subtaxa: Blechnum
Distribution:
• Quaternary of Argentina (2 collections), India (2)
• Miocene of Venezuela (1)
• Oligocene to Miocene of Australia (1)
• Oligocene of Argentina (2), Australia (1)
• Eocene of Argentina (1)
• Tertiary of Venezuela (1)
• Paleocene of United States (4: Colorado, Wyoming)
• Cretaceous to Paleogene of United States (1: Colorado)
• Cretaceous of Antarctica (1), Canada (1: Alberta)
• Jurassic to Cretaceous of the Russian Federation (1)
Total: 19 collections each including a single occurrence