FIGURE 5. Life cycle of Ginkgo biloba. This species is dioecious: ovulate (A) and staminate (B). two ovules on a common peduncle (C), two mature microsporangia from a staminate strobilus (D). Pollen develops from a microspore (F), in which the microgametophytes germinates (F) and develops (G) in the pollen chamber of the ovule (H). Sperm nuclei are delivered to the archegonia by pollen tubes (G). The embryo (I) develops within a seed that has a fleshy berry-like outer integument (I & J).