homosporous background writing

background backgrounds beautiful botanical botany closeup conelike detail elateridae elaters equisetopsida equisetum fern ferns field flora fossil green growth homosporous horse horsetail leaf living macro meiosis microphylls microscope microscopic nature perennial plant plants prothalli rushlike science scientific scouringrush sporangia sporangiophores sporangium spore spores stem strobili strobilus tail underside vascular vector