Text-fig. 4. Tumidopteris astra sp. nov., holotype GIN 4851/343h, morphology of sori (a, b, c), epidermal structure (e) and the sterile pinna (d; spec. 4851/344). a: partly damaged...

Text-fig. 1. Geographical position of the localities studied. in A New Species Of The Genus Tumidopteris Naugolnykh From The Permian Of The Pechora Cis-Urals, Russia

Text-fig. 6. Comparative analysis of the three genera (Prynadaeopteris RADCZ., Geperapteris S.V.MEYEN, Tumidopteris NAUGOLNYKH) with possible affinity to Gleicheniaceae from the Pe...

Text-fig. 3. Tumidopteris astra sp. nov., holotype GIN 4851/343h, morphology of sori. a: part of fertile pinnule; b: one practically complete sorus located on the terminal part of...

Text-fig. 5. Tumidopteris astra sp. nov., holotype GIN 4851/343h, morphology of sori. a, b: line tracing of the sorus; c: an isolated spore preserved on the sporangium. Scale 500 Μ...