The Mississippian Flora

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Abstract
David White recognized two phases of the Mississippian flora[long dash]a lower or Pocono and an upper or Chester. The Pocono is distinct from the Devonian below and is characterized by Triphyllopteris and Lepidodendropsis The most characteristic forms in the Chester flora are Cardiopteris polymorpha, lycopods similar to Lepidodendron volkmannianum. and Asterocalamites. and these separate it from the Pennsylvanian above. The few comparisons of the Mississippian floras of the U. S. with floras of similar age in Europe seem to indicate that these closely approximate the Lower Carboniferous flora of Great Britain and those of the Dinantian of the continent. The floras of the Wedington sandstone in Arkansas and the Reeds Spring formation of Missouri are the only representatives of Mississippian age from the mid-continent and these appear to belong to the Chester phase. The flora of the New Albany shale, previously assigned to Devonian age, is discussed, and the author presents arguments for its inclusion in the Mississippian.

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