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Megaspores

      Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. These types of plants have two spore types, megaspores and microspores. Generally speaking, the megaspore, or large spore, germinates into a female (egg-producing) gametophyte, which is fertilized by sperm produced by the male gametophyte developing from the microspore.

Source: http://en.wikipedia.org/wiki/Megaspore
Arcellites medususKnobloch (1984), Pl. XV, fig. 4 EK63
Arcellites medususKnobloch (1984), Pl. XV, fig. 7 EK65
Arcellites medususKnobloch (1984), Pl. XV, fig. 1 EK80
Arcellites medususKnobloch (1984), Pl. XV, fig. 8 EK82
Arcellites medususKnobloch (1984), Pl. XV, fig. 9 EK62
Arcellites medususKnobloch (1984), Pl. XV, fig. 3 EK81
Arcellites medususKnobloch (1984), Pl. XV, fig. 2 EK79
Arcellites medususKnobloch (1984), Pl. XV, fig. 9 EK61
Arcellites medususKnobloch (1984), Pl. XV, fig. 6 EK64
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 8 EK123
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 7 EK126
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 9 EK125
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 10 EK122
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 11 EK171
Bacutriletes argusKnobloch (1984), Pl. VIII , fig. 12 EK127
Bacutriletes kerharticensisAD, Knobloch (1979), Pl. III, fig. 11 EK193
Bacutriletes kerharticensisAD, Knobloch, (1979), Pl. II, fig. 12 EK211
Bacutriletes pragensisAD, Knobloch (1979), Pl. IV, fig. 13 EK196
Bacutriletes pragensisAD, Knobloch (1979), Pl. IV, fig. 14 EK195
Bacutriletes pragensisAD, Knobloch (1979), Pl. IV, fig. 15 EK194

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