Quercus (Fagaceae)

Quercus rober
U Conn Plant Database

Quercus rober
Univ. Uppsala

Quercus gambellii
Martin & Drew

Shrubs to large trees, up to 30m, deciduous or evergreen, generally with rounded canopies. Leaves entire (live oaks) to pinnately lobed with rounded to coarsely toothed lobes. Flowers monoecious, male flowers are pendulous yellow-green catkins, fruit an acorn.

Pollen light micrograph:
Pollen prolate, oval with sub-parallel equatorial region. Tricolpate with relatively short, straight furrows, occasionally bent in the pore areas. Surface verrucate to scabrate with elements of various sizes.

Pollen scanning electron micrograph (SEM)
Note variability in sizes of scultpure elements, and their aggregate nature.

Production and Dispersal:
Moderate to high production and good dispersal.

Well preserved.

Fossil Occurrence:
Foliage and fruits common in Tertiary sediments, Quercus pollen is present in the Middle Eocene Claiborne Formation, the Oligocene Florissant Flora (Tsuchdy & Scott, 1969) and in the John Day, Ore., Fossil Beds

    Chaney, R. W. Chuang, C-C. 1968.
    An Oak-Laurel Forest in the Miocene of Taiwan. Proceedings of the Geological Society of China 11: pp. 3-19

    Hall, Stephan A. 1998.
    Oak Pollen Influx in the Sangre De Cristo Range, New Mexico, U.S.A. Current Concepts in Pollen-Spore and Biopollution Research 12: 99-104.

    Tsuchdy, R.H. and Scott, R.A. 1969.
    Aspects of palynology. Wiley Interscience.
Pollen Morphology
    Planchais, N. 1963.
    T Le pollen de quelques chenes du donnine Medeterraneen occidental. Pollen et Spores 4: 87-93.

    Solomon, A.M. 1983.
    Pollen morphology and plant taxonomy of white oaks in Eastern North America. American Journal Botany 70: 481-494.

    Solomon, A.M. 1983.
    Pollen morphology and plant taxonomy of red oaks in Eastern North America. American Jour Botany 70: 495-507.

    Vishnu-Mittre, Singh, G. 1963. On the Pollen of the Western Himalayan Oaks. The Journal of the Indian Botanical Society 42: 130-134.
Owen Davis 9/00