“Stages in the formation of the megaspore, its germination, fertilization of the egg and endosperm cells. B, nu, nucellus” -Stevens, 1916
William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)
934×2400, 273.6 KiB
398×1024, 32.6 KiB
249×640, 16.8 KiB
124×320, 7.3 KiB