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. 2018 Oct 9;9:1450. doi: 10.3389/fpls.2018.01450

FIGURE 1.

FIGURE 1

The homosporous fern life cycle. Sporophyte tissues, which are usually but not necessarily diploid, are shown in green. Gametophyte tissues and spores, which are often but not necessarily haploid, are shown in brown. Spores are generated by meiosis in sporangia. Gametes, both eggs and sperm, are generated by mitosis in archegonia and antheridia, respectively. For simplicity, fertilization is depicted between an egg and sperm from the same gametophyte, but fertilization is also likely to occur between gametes from different gametophytes that are derived from the same or different sporophytes. an, antheridium; ar, archegonium; e, egg; gam, gametophyte; spa, sporangium; spe, sperm; spo, spore; sporo, sporophyte; z, zygote. Images are not to scale.

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