The Structure and Classification of Four Plants from the New Albany Shale

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Abstract
Four spp. reported from the New Albany shale flora of Lower Mississippian age are reviewed and their original brief descrs. emended. 3 of the 4, representing genera which elsewhere are known only from the Lower or Middle Devonian, compare unfavorably with the type spp. and are transferred to new genera of uncertain affinities. These are: STENOKOLEOS setchelli (Asteroxylon s. Read and Campbell), REIMANNIOPSIS indianensis (Reimannia i. Read and Campbell), and GUYCAMPBELLIA microphylla (Protolepidodendron microphyllum Read and Campbell). Thus any inference of a Devonian character of the New Albany flora based on the selection of these established Devonian genera must be abandoned. Callixylon brownii (Read) Hoskins and Cross, emend.,is transferred from Pitys. It is considered to be a representative sp. of the genus which has heretofore been known throughout the Upper Devonian. This has the effect not only of extending the range of Callixylon into the Lower Mississippian but also of removing the genus as an unqualified Upper Devonian index fossil.

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