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 discoensis	Knobloch (1981), Pl. III, fig. 13	EK58
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 5	EK38
Costatheca diskoensis	Knobloch (1981), Pl. III, fig. 7	EK44
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 2	EK1
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 1	EK7
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 11	EK10
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 7	EK15
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 15	EK16
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 13	EK27
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 3	EK53
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 11	EK4
Costatheca diskoensis	Knobloch (1984), Pl. II, fig. 17	EK11
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 20	EK33
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 20	EK36
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 6	EK40
Costatheca diskoensis	Knobloch (1981), Pl. IV, fig. 5	EK42
Costatheca diskoensis	Knobloch (1981), Pl. IIII, fig. 15	EK56
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 5	EK5
Costatheca diskoensis	Knobloch (1981), Pl. I, fig. 4	EK6
Costatheca diskoensis	Knobloch (1981), Pl. II, fig. 14	EK8

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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]