fern life cycle

abstract adult antheridium archegonium asexual biology closeup cycle develops diagram diploid dispersal dispersion egg embryo environment fern fertilisation flora forest frond fronds gametes gametophyte germination green growth haploid illustration koru leaf life macro mature meiosis mitosis nature nobody photosynthetic plant pterophyta reproduction reproductive rhizome roots sexual sori sorus sperm sporangia sporangium spore sporophyte tree vector