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

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