Concept
Version 8
Created by Boundless
Sexual Reproduction in Gymnosperms
Male and female gametophytes
These series of micrographs shows male and female gymnosperm gametophytes. (a) This male cone, shown in cross section, has approximately 20 microsporophylls, each of which produces hundreds of male gametophytes (pollen grains). (b) Pollen grains are visible in this single microsporophyll. (c) This micrograph shows an individual pollen grain. (d) This cross section of a female cone shows portions of about 15 megasporophylls. (e) The ovule can be seen in this single megasporophyll. (f) Within this single ovule are the megaspore mother cell (MMC), micropyle, and a pollen grain.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Reproductive Development and Structure. October 17, 2013."
http://cnx.org/content/m44722/latest/Figure_32_01_09.jpg
OpenStax CNX
CC BY 3.0.