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Ferns s.s. (Filicopsida)

      Leptosporangiate ferns are the largest group of living ferns. They are often considered to be the class Filicopsida, Pteridopsida or Polypodiopsida, although other classifications assign them a different rank. The leptosporangiate ferns are one of the four major groups of ferns, with the others being Marattiopsida, Equisetopsida (horsetails), and Psilotopsida (whisk ferns and ophioglossoid ferns). There are approximately 9000 species of living leptosporangiate ferns, compared with about 260 for all other ferns put together. Almost a third of leptosporangiate fern species are epiphytes. These ferns are called leptosporangiate because their sporangia arose from a single epidermal cell and not from a group of cells as in eusporangiate ferns. The sporangia are typically covered with a scale called the indusium, which can cover the whole sorus, but can also be strongly reduced. Many leptosporangiate ferns have an annulus around the sporangium, which ejects the spores. http://en.wikipedia.org/wiki/Polypodiopsida
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Sphenopteris germanica ZŠ891
Sphenopteris germanicaŠimůnek (2022), PL. 6, Fig. 6 ZŠ890
Sphenopteris laurenti p4650
Sphenopteris mixta ZŠ777
Sphenopteris mixta ZŠ775
Sphenopteris mixta ZŠ776
Sphenopteris mixta ZŠ759
Sphenopteris obtusiloba p4654
Sphenopteris obtusiloba WA172
Sphenopteris pulcherrima ZŠ792
Sphenopteris WA184
Sphenopteris WA312
Sphenopteris WA307
Sphenopteris ZŠ356
Sphenopteris ZŠ531
Sphenopteris ZŠ874
Taeniopteris abnormisŠimůnek (2022), PL. 7, Fig. 7 ZŠ895
Taeniopteris bertrandiana ZŠ513
Taeniopteris jejunala ZŠ514
Taeniopteris multinervisŠimůnek a Martínek (2009), Pl. 4, fig. 6 ZŠ201

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]