schematic representation of equisetum fertilisation. antherium with male gametes called antherozoids or sperm and archegonium

antheridium antherozoid archegonium arvense background biology botany cell developing diagram drawing equisetum fern fertilisation fertilization gamete gametes gametophyte germinating germination green horsetail illustration isolated male morphology nature phytomorphology reproduction schematic scheme sperm structure vector white zygote