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

Pecopteris polymorpha	Šimunek (1994), Pl. II, fig. 4	ZŠ81
Pecopteris polymorpha		WA125
Pecopteris polymorpha		WA112
Pecopteris polymorpha	Šimůnek (1994), Pl. II, fig. 4	ZŠ85
Pecopteris polymorpha		ZŠ182
Pecopteris polymorpha	Zodrow et al. (2006), Pl. 11, fig. 2	ZŠ91
Pecopteris polymorpha		ZŠ87
Pecopteris polymorpha		ZŠ88
Pecopteris polymorpha		ZŠ82
Pecopteris polymorpha		WA134
Pecopteris polymorpha		ZŠ84
Pecopteris polypodioides		ZŠ418
Pecopteris polypodioides		ZŠ419
Pecopteris polypodioides	Šimůnek (1994), Pl. II, fig. 5	ZŠ47
Pecopteris polypodioides		ZŠ315
Pecopteris polypodioides		ZŠ406
Pecopteris polypodioides	Šimůnek (1994), Pl. II, fig. 3	ZŠ45
Pecopteris polypodioides		ZV418
Pecopteris polypodioides		ZV419
Pecopteris polypodioides	Šimůnek (1994), Pl. II, fig. 4	ZŠ46

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