microsporangium

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Related to microsporangia: microsporocyte

microsporangium

the sporangium from which the microspores are formed, which in higher plants is the pollen sac. see ANTHER.
References in periodicals archive ?
(1989) described a group of three stamens from the late Albian of the Potomac Group as a tripartite androecium with two pairs of microsporangia on all three parts.
muricata has subterranean stems, dark brown to black ovulate strobili with long peduncles (16-28 cm long), and grey pollen strobili with microsporophylls bearing 12-16 microsporangia segregated into two separate groups along margins.
Using one of the search engines on the Internet, such as Google, Yahoo!, Ask.com, or MSN Live Search, find more information by searching for these words or phrases: after riping, dioecious, generative cell, integument, microsporangia, microspore mother cell, nucellus, ovule, polyembryony, seed coat, self-incompatible, and tube cell.
trijurca Reproductive organs Unisexual; on the same +/+ or separate plants Pollen Small; light; non- +/+/+ clumping Pollen grains per ovule Large numbers + Microsporangia Elevated; subtended by +/- slender elastic "beams" Ovulate structures Exposed; reduced in 1 number; attractants absent Pollen receptive Exposed and "sticky"; +/- surfaces large but dissected Plants Growing in open sights; +/?
microsporophyll: Leaflike structure giving rise to one or more microsporangia.
In light of the preceding, we can accept that there is enough morphometric and observable morphological differences between Zamia stevensonii, as here presented, and the other species to which it has been compared or with which it has been mistaken to warrant its inclusion as a new species, considering the geographic range, white emergent leaves, relatively small above or below-ground stems, small number of pollen cones per plant, smaller size of ovulate and pollen cones, and having microsporangia only on the abaxial surface of the microsporophylls.
The reproductive structures of the pteridosperms were likewise phylogenetically terminal; later the microsporangia became aggregated into synangia and the seeds were borne on modified or unmodified portions of the frond.
microsporangia (pollen sacs) on abaxial surfaces, with a simple sterile
with 500-900 microsporangia. Megasporophylls 15-25 in a crown and with
generic level, of the trichomes of leaves, microsporangia, and seeds.