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Topic: Megaspore

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	Pteridophyta - LoveToKnow 1911 (Site not responding. Last check: 2007-11-03)
		In the megasporangium, on the other hand, the four megaspores, which arise from a single mother-cell, are nourished at the expense of the other sporogenous cells and of the tapetum.
		The megaspore becomes filled with the female prothallus, the formation of cell-walls commencing at the pointed end of the spore, where from the first the nuclei are more numerous, and later extending to the base.
		The single large megaspore contained in each megasporangium produces a small prothallus, which bears one or a few archegonia; these are exposed on the surface of the prothallus at the summit of the germinated megaspore (fig.
	www.1911ency.org /P/PT/PTERIDOPHYTA.htm (11119 words)

	ASPT NEWSLETTER 9(2)
		The rest of Mirbelieae have two kinds of very distinct megagametophytes, the newly described Mirbelia- and Jacksonia-types.
		They differ collectively from the Polygonum type in being derived from other than just the megaspore located at the chalazal end, having other than the uniform 8 nuclei per megagametophyte, and in numbering often more than 1 per ovule.
		It is suggested that part of the driving force behind megagametophyte variation seen in these tribes is apomixis.
	www.inhs.uiuc.edu /~kenr/ASPT/newsletter09_2.html (15218 words)

	Plant Science Bulletin - June 1970, Volume 16, Issue 2 (Site not responding. Last check: 2007-11-03)
		In mammalian oogenesis reduction division yields one functional egg and one or three polar bodies, thus theoretically removing a set of chromosomes from the scene but conserving cytoplasm for the functional egg.
		In the majority of angiosperm life cycles reduction division leads to a parallel of one functional megaspore and three nonfunctional megaspores.
		Many of our students complete an introductory botany or biology course and remain unaware of the correspondence, if not possible homology, of moss spores, fern spores, basidiospores, microspores, and megaspores.
	www.botany.org /PlantScienceBulletin/psb-1970-16-2.php (9554 words)

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