Pollenatlas

species: Ranunculus acris (Meadow Buttercup)
plant family: Ranunculaceae
at aerobiological analyses usually achieved determination level: Ranunculus, Ranunculaceae

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: in polar view almost circular, circular to oval in equatorial view
size: polar axis: 31.3 (29-33) µm, equatorial axis 33 (32-35) µm.
apertures: tricolpate pollen with indistinct colpi, rounded at their ends. Membrane of the colpi covered with fine exine remnants.
pollen wall: thin, scabrate exine, intine about as thick as the exine.
additional attributes: granular cytoplasm.

remarks to the plant:
The Eurasian Meadow buttercup is common in meadows and grassland. On pastures, it often stands conspicuously erect where cattle have grazed around it. The erect hairy perennial herb is characterized by its golden-yellow flowers and 3-5 jaggedly divided palmately lobed leaves. Stamens maturate from the outer margin inwards. The stigmata develop short before the innermost stamens break open. Flowering time is April to September.

species: Rhododendron ferrugineum (Alpenrose)
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 stratum
size: 35.6 (32-39) µm
apertures: tricolporate monads with distinct, narrow furrows.
pollen wall: thin, psilate or verrucate exine, thin intine.
note: further representatives of the Ericaceae family present similar pollen (for instance Erica, Vaccinium, Arctostaphylos, Loiseleuria….

remarks to the plant:
The Rusty-Leaved Alpenrose is a typical central- and south European Alpine shrub. It grows in woods and pastures in the montane and alpine levels preferably around timber line on moist, poor, acid soils. This evergreen shrub has leathery, ovate leaves, bended inwards at the margins; dark green above, and rusty brown on bottom. Its shining dark red funnel shaped flowers appear in clusters from June to August.

species: Robinia pseudoacacia (False Acacia, Black Locust)
plant family: Fabaceae
at aerobiological analyses usually achieved determination level: Robinia, Fabaceae

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: in polar view rounded triangular, circular to ovate in equatorial view
size: polar axis: 29.2 (28-30) µm, equatorial axis 31 (29-32) µm.
apertures: tricolpate pollen with short, narrow, not clearly demarcated colpi. Pori almost not visible under usual resolution of light microscopy.
pollen wall: thin, psilate exine, in most cases only feebly stained; intine clearly thicker (approx. 1.5-2 µm)
additional attributes: cytoplasm protrudes often at the apertures, curving the thin, abating exine outwards at the boundaries of the colpi

remarks to the plant:
False Acacia originates from North America. In Europe it has been planted as an ornamental, later it ran to seed and grows now pervasive over wide areas, even overpowering the indigenous vegetation. The deciduous tree has spiny twigs and pinnate leaves with numerous pairs of elliptic, dark, dull, blue-green leaflets. It grows preferably in light, sandy and dry soils. The pendulous clusters of pea-like flowers are creamy white, fragrant, and appear in late May and early June.

species: Rumex acetosa (Common Sorrel)
plant family: Polygonaceae
at aerobiological analyses usually achieved determination level: Rumex, Polygonaceae

photos: Landesagentur für Umwelt, Bozen (Italy)

description:
outline: circular
size: 22.4 (20-29) µm
apertures: tricolporate, sometimes tetracolporate pollen with very narrow, acute colpi and hardly detectable pori.
pollen wall: thin, foveolate (reticulate) exine, thin intine.
additional attributes: granular cytoplasm, contains numerous leucoplasts

remarks to the plant:
Common sorrel grows widespread in meadows and weedy habitats. This perennial, herbaceous species with slightly succulent leaves is found from the lowlands up to sub-alpine mountain ranges and prefers nutritient-rich soils. It is wind-pollinated with modestly branched greenish-reddish inflorescences. Flowers are mostly unisexual, united in panicles. Flowering time is primarily May to August.