fern and sporangium

abstract background beauty biology botanical botany closeup conifers design detail ecology environment fern ferns foliage frond green growth haploid leaf leaves macro meiosis mesophyll micrograph microscope microscopic moist ornamental pattern patternn plant polypodiopsida polypodium polystichum powder reproduction science scientific sori sorus sporangia sporangium spore spores sporophyte stem tropical underside wallpaper whisk