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A sporangium bearing microspores.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the multicellular organ of heterosporous Pteridophyta and seed plants in which the microspores develop. In Selaginella and Sigillaria the microsporangia are located singly in the axils of microsporophylls or on the upper-sides of the leaves (in Lepidodendron, Pleuromeia, and Isoetes). In Pleuromeia and Isoetes they are submerged in a special cavity. In some extinct ferns the microsporangia are on the underside of the sporophylls. In water ferns they are formed in sporocarps: 64 microspores develop in the microsporangium of Sahinia, and 32 or 64 in the microsporangium of Marsilea. In gymnosperms the microsporangia develop singly on microsporophylls (in some joint firs); more often several develop on a microsporophyll, arranged singly (conifers), in sori (many sago palms, ginkgoes) or in synangia (Caytoniales, many Bennettitales, Ephedra, Welwitschia). In angiosperms the pollen sac of the anther is homologous to the microsporangium.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Microsporangiate cones narrowly ovoid, yellow to brown,
microsporangiate cones with small, short microsporophylls and thickened
subsp, clivicola in the larger microsporangiate cones with longer and
Microsporangiate cones narrowly ovoid, orange or brown, 25-35 cm long,
narrow leaflets, its medium microsporangiate cones with shorter apical
distinguished by its much smaller microsporangiate cones and its flat
small oblong microsporangiate cone distinguishes it from the C.
slender microsporangiate cones, and its relatively narrower and more
Microsporangiate cones are smaller than those of most of the C.