sporangia on fern. groupes de sporanges on fern leaves. reproduction of olypodiopsida or polypodiophyta

abstract background botany circle closeup clusters color detail dot ecology environment fern ferns foliage fresh freshness garden green group grow growth leaf leave macro natural nature organic outdoor pattern plant polypodiophyta polypodiopsida reproduction ripe season seed sorus sperm sporanges sporangia sporangium spore stem structure summer switzerland texture tropical vascular veins