Pollenatlas

Dieser POLLENATLAS enthält derzeit bereits über 90 verschiedene Pollentafeln mit Bildern und Beschreibungen der Pollen, die öfters in Luftproben anzutreffen sind.

Autorenschaft: Der Pollenatlas wurde von Edith Bucher und Veronika Kofler (Biologisches Labor der Landesagentur für Umwelt, Bozen) erstellt, ausgearbeitet und zur Verfügung gestellt.

  • Xanthium italicum

    pollen in optical section (1)
    pollen in optical section (1)
    exine sculpture, apertures (1)
    exine sculpture, apertures (1)
    pollen in optical section (2)
    pollen in optical section (2)
    exine sculpture, apertures (2)
    exine sculpture, apertures (2)

    species: Xanthium italicum (Italian cockleburr)
    plant family: Asteraceae
    at aerobiological analyses usually achieved determination level: Xanthium, (Asteraceae)

    photos: © Landesagentur für Umwelt, Bozen (Italy)

    description:
    outline:     circular
    size: polar axis: 23.1 (21.8-24.7) µm, equatorial axis: 23.5 (21.8-25.7) µm.
    apertures: tri-zono-colpate with very short, acute colpi.
    pollen wall: exine about 1-1.5µm, scabrate with extremely short, blunt spines (microechinate). Thin intine, negligibly thickened near the colpi.
    note: similar pollen: Ambrosia

    remarks to the plant:
    Probably the Italian cocklebur originates from North America, but it is widespread today over manifold regions all over the world. It grows preferably along roadsides, low ground, on waste places and stream banks. The flowers are monoecious and are pollinated by insects, they appear in late summer and autumn. The plant is self-fertile. Male flower heads in the upper leaf axes carry numerous flowers; females are located lower on the plant and consist of only tow flowers. Antibacterial and cytotoxic agents were found in extracts of X. italicum leaves.

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