Sporangia Sporophyll Cone axis (A) (B) (C) Courtesy of Dr. Knut Norstog. Used with permission by Paul Norstog FIGURE 22-27 (A) Pollen cone, more than 30 cm long, in Cycas circinnalis. It is a simple cone, with one axis that bears microsporophylls. (B) Microsporophylls in cycads may bear many microsporangia. (C) Sperm cells of cycads have hundreds of flagella and must swim to the egg cell. Zamia (×165).

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Embryology