Text-fig. 6. Comparative analysis of the three genera (Prynadaeopteris RADCZ., Geperapteris S.V.MEYEN, Tumidopteris NAUGOLNYKH) with possible affinity to Gleicheniaceae from the Permian deposits of Angaraland. a–c: Tumidopteris NAUGOLNYKH; d–f: Prynadaeopteris RADCZ. (based on Radczenko 1955, 1956, Naugolnykh 2013); g–i: Geperapteris S.V.MEYEN (based on Meyen 1982, Naugolnykh 2013). Left column – sori in plan (frontal view); central column – leaves; right column – sori in cross-section; FL – flattened sori; HS – hemispherical sori. Scale 1 cm (b, h), 5 mm (e), 1 mm (a, d), 0.5 mm (g); c, f, i – figures schematically drawn without scale. in A New Species Of The Genus Tumidopteris Naugolnykh From The Permian Of The Pechora Cis-Urals, Russia