BOT300 Home Page

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]


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).



[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.




Acer; tricolpate.


Fagus; tricolporate.


Alnus; 4- to 5-porate.


Betula; triporate.


Salix; tricolporate.


Fraxinus; 3- to 4-colporate.



[Back to TOP] 

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)

|BOT300S Home Page | U of T Botany | University of Toronto |

© 2003 Botany Department, University of Toronto.

Please send your comments to; last updated 27-Feb-2003