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. 13	EK9
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 8	EK13
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 1	EK18
Costatheca diskoensis	AD, Knobloch (1981), Pl. II, fig. 2	EK19
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 3	EK20
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 23	EK24
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 15	EK35
Costatheca diskoensis	Knobloch (1981), Pl. IIII, fig. 12	EK55
Costatheca diskoensis	Knobloch (1981), Pl. IIII, fig. 16-17	EK57
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 27	EK21
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 25	EK23
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 22	EK34
Costatheca diskoensis	Knobloch (1981), Pl. IV, fig. 7	EK45
Costatheca diskoensis	Knobloch (1981), Pl. III, fig. 8	EK47
Costatheca diskoensis	Knobloch (1981), Pl. IV, fig. 10	EK48
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 9	EK50
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 16	EK12
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 18	EK17
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 26	EK22
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 24	EK25

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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]