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Palynology1 (defined) (06-Mar-03)


Pollen images - From the University ofArizona Palynology site Pollen Grain of the Month pages

[if these pages take a long time to load try clicking your browser's "stop loading" button; the page should then appear with some broken image links, but there will be links to other images that should work]

Gymnosperms

Psedotsuga and Larix. These genera are unusual in the Pinaceae because of their bladderless pollen grains (compare Picea below). As a consequence, its pollen is less buoyant and travels less far.

 

Picea. P. glauca has the largest pollen in the Pinaceae (nearly 0.1 mm across).

 

Angiosperms

[for these first four entries click HERE to go to an online catalog of images arranged by family]

Asimina triloba tetrad of pollen grains (each approx. 20 µm in diam. and inaperturate).

 

Lauraceae (L, C, Lindera benzoin; R, Sassafras albidum; diam. approx. 20 µm); inaperturate. Lauraceae pollen lacks sporopollenin almost completely.

 

Magnolia macrophylla (equatorial diam. approx. 35-40 µm); monocolpate.

 

Crataegus (C. succulenta, C. pruinosa, C. laurentiana; diam. approx. 20-30 µm); tricolporate. Adams and Morton observe that Crataegus pollen grains, "... show more variation... within a single flower than they do between series and species of the genus..." Pollen in the Rosaceae is generally not much help in separating genera, although a few are distinctive.

 

Ericaceae

 

Acer; tricolpate.

 

Fagus; tricolporate.

 

Alnus; 4- to 5-porate.

 

Betula; triporate.

 

Salix; tricolporate.

 

Fraxinus; 3- to 4-colporate.

 

Pollination

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Further reading

Arizona palynology site

Judd et al. (2002), Chapter 4 - pp. 94-95.

Gajewski, K. (2002). Pollen identification.

Pollen grain images on the web

Siteseer (software for viewing regional fossil pollen data)


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