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    Conductive vessel element in mountain mahogany wood (Cercocarpus sp), coloured scanning electron micrograph (SEM). — Stock Photo
    Conductive vessel element in mountain mahogany wood (Cercocarpus sp), coloured scanning electron micrograph (SEM).
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Horse chestnut pollen grain — Stock Photo
    Horse chestnut pollen grain
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem. — Stock Photo
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem.
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem. — Stock Photo
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem.
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Light micrograph of plant cells. Plant cells have cell walls, constructed outside the cell membrane and composed of cellulose, hemicelluloses, and pectin. — Stock Photo
    Light micrograph of plant cells. Plant cells have cell walls, constructed outside the cell membrane and composed of cellulose, hemicelluloses, and pectin.
    Planktonic unicellular alga Diploneis sp. — Stock Photo
    Planktonic unicellular alga Diploneis sp.
    Climbing lily pollen — Stock Photo
    Climbing lily pollen