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Angiosperms are again divided into the monocotyledons, as the palms, and dicotyledons, which include most European trees. Thus: Adolphe Brongniart termed the coal era the "Age of Acrogens," because, as we shall see, of the great predominance in those times of vascular cryptogamic plants, known in Dr Lindley's nomenclature as "Acrogens." Spenophyllum cuneifolium.
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