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      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

Valvisisporites nitens Kalibová, 1959

Inv. no.	YA1387
Taxonomy	Oddělení: Pteridophyta / Třída: "megaspory" / Rod: Valvisisporites / Druh: nitens
Description
Chronostratigraphy	paleozoikum - karbon - stephan - westphal
Status	Holotype
References	Kalíbová (1959), Tab. 3, fig. 1(vz. 11 Km4/1534)

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