Pollenatlas

species: Elaeagnus angustifolia (Russian Olive)
plant family: Elaeagnaceae
at aerobiological analyses usually achieved determination level: Elaeagnus

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: rounded triangular in polar view with three protruding germination spots, oval in equatorial view (seldom seen)
size: polar axis: 37.3 (36-40) µm, equatorial axis: 46.5 (43-48) µm
apertures: tricolporate pollen with large pori (6-7 µm) which are crossed by narrow colpi
pollen wall: thin psilate exine, the ectexine forms a clearly discernible vestibulum underneath the pori; intine slightly thickened in the area of the germination openings and sometimes protruding
additional attribute: fine granular cytoplasma

remarks to the plant:
Russian Olive originated from Asia and has been naturalized in the Mediterranean and in Central Europe. It prefers sunny habitats and moderately moist, light sandy soils. The narrowly ovate-elliptical, willow-like leaves are covered with silvery scales underneath, and so are the young branches. In late spring and early summer, tufts of small, sweet-smelling, yellow-white flowers appear, offering plenty of nectar for the bees. The olive-like fruits are yellowish with a silvery coat.

species: Ephedra fragilis (Meerträubchen)
plant family: Ephedraceae
at aerobiological analyses usually achieved determination level: Ephedra, Ephedraceae

photos: Landesagentur für Umwelt, Bozen (Italy)

species: Erica carnea (Winter-flowering Heath)
plant family: Ericaceae
at aerobiological analyses usually achieved determination level: Ericaceae

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: tetrade with trilobate shape, mostly three monads lie in the same level
size: 32.9 (30-35) µm
apertures: tricolporate monads with distinct, long and narrow colpi.
pollen wall: thin, verrucate exine, thin intine.
note: further representatives of the Ericaceae family present similar pollen (for instance Rhododendron, Vaccinium, Arctostaphylos, Loiseleuria…

remarks to the plant:
Winter-flowering Heather is a typical plant for central- and southern European mountain ranges. It prefers dry, shallow, calcareous soils. This small dwarf shrub has evergreen linear leaves (needles) and vivid pink bell-shaped flowers in dense terminal clusters. The brown-red anthers are protruding from the corolla. Flowering time is February to June.

species: Eucalyptus sp.
plant family: Myrtaceae
at aerobiological analyses usually achieved determination level: Myrtaceae

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: in polar view triangular, seldom more or less circular, elliptical in equatorial view.
size: polar axis: 13.7 (12.9-14.8) µm, equatorial axis: 17.6 (16.8-19.8) µm.
apertures: tri-, sometimes tetra-zono-colporate, syncolpate, pori ca. 3 µm in diameter, colpi narrow, fusing in the polar area thus forming a central triangle.
pollen wall: thin, psilate exine, often thickened around the pori. Thin intine, forming convex, approx. 4-7 µm wide onci. Pollen wall about 1 µm thick.
note: similar pollen: Myrtus, Frangula

remarks to the plant:
The evergreen Eucalyptus is native from Australia and Tasmania with a large number of species. Some species have been introduced to Southern Europe as ornamentals, for reforestation and for production of wood for the paper industry. Frequently planted in the Mediterranean are for instance E. globulus, and E. camalduensis.
Flowers appear either single or in tufts, they reveal numerous, white-yellowish or reddish stamens. Flowering time is different: E. globulus flowers from April to July, other species in late summer.