[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.
Alnus; 4- to 5-porate.
Fraxinus; 3- to 4-colporate.
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 email@example.com; last updated 27-Feb-2003