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

Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 4	EK29
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 9	EK30
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 19	EK37
Costatheca diskoensis	Knobloch (1981), Pl. III, fig. 4	EK43
Costatheca diskoensis	Knobloch (1981), Pl. IV, fig. 9	EK49
Costatheca diskoensis	Knobloch (1981), Pl. IIII, fig. 11	EK54
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 21	EK32
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 10	EK41
Costatheca diskoensis	Knobloch (1981), Pl. IIII, fig. 2	EK52
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 10	EK2
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 14	EK26
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 18	EK39
Costatheca diskoensis	Knobloch (1981), Pl. III, fig. 6	EK46
Costatheca diskoensis	Knobloch (1981), Pl. IV, fig. 4	EK51
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 3	EK3
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 6	EK14
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 8	EK28
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 16-17	EK31
Echitriletes zemechensis	Knobloch (1984), Pl. VIII , fig. 4	EK150
Echitriletes zemechensis	Knobloch (1984), Pl. VIII. , fig. 6	EK166

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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]