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Megasporangium

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megasporangium [¦meg·ə·spə′ran·jē·əm]
(botany)
macrosporangium
Megasporangium 

in heterosporous Pteridophyta and in seed plants, the organ in which one or several megaspores develop. Megasporangia are found singly in the axils of sporophylls (in Selaginella), on the sporophyll in a special cavity (in Isoetes), or inside sporocarps (in the order Hydropteridales). In seed plants the nucellus—the central part of the ovule—is homologous to the megasporangium.
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Bertrand and its megasporangium Bensonites fusiformis R.
FOSSILS AND FERN PHYLOGENY by The Botanical Review
Megasporangium, megasporogenesis and megagametogenesis.
The nucellus and chalaza in monocotyledons: structure and schematics by Rudall, Paula J. / The Botanical Review
5 mm in diameter, each produce a single megasporangium containing a single megaspore, which is much larger than a microspore.
Azolla: a review of its biology and utilization by Wagner, Gregory M. / The Botanical Review
 
 
 
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