Key to the Quaternary Pollen and Spores of the Great Lakes Region 3 colpi meridionally arranged 15 Tricolporate p. 1 More than 3 colpi meridionally arranged 16 Stephanocolporate p. Key to Spore Classes A. Spore without aperture 1 Alete p. 13 AA. Spore with slit-shaped aperture (laesura) B. Spore with single laesura 2 Monolete p. 13 BB. Spore with triradiate laesurae 3 Trilete p. 13

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A sieving method is described for concentrating pollen and spores from fine-grained sediments. The effectiveness of nylon screens with 5, 7, 10, and 15 μm meshes was tested in comparison with both standard digestion and sodium pyrophosphate suspension procedures.Sieving through 7 μm mesh screens recovers more pollen than any of the other methods tested and effectively removes fines with a negligible loss of pollen (0.4%). We recommend this method for general use with fine-grained minerogenic sediments. Thus, it is possible to process and count more reliably to statistically significant sums, clay and silt-rich samples previously considered either barren of pollen or too time consuming to count.

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