backgrouds of fern and sporangium.

abstract background backgrounds beautiful botanical botany cell close conifers detail fern ferns flora fresh frond green haploid homosporous leaf leaves lycophytes macro meiosis microscope moist nature ornamental plant polypodium polystichum powder rainforest reproduction ripe science seed sori sorus sporangia sporangium spore spores sporophylls sword texture thailand underside vascular whisk white