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Tricolpate pollen grains, described in the present paper under the name Tricolpites (Eucommiidites) Troedssonii nova sporomorpha, occur regularly in the early Jurassic shale at Pålsjö in northwestern Seania. Grains or spores of this particular type have only been met with among dicotyledonous plants. They do not, according to our present knowledge, occur in recent and fossil monocotyledons, chlamydosperms, gymnosperms, ferns, or mosses.
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