Fossil plants, Vol. 2: A text-book for students of botany and geology - A. C. Seward

FOSSIL PLANTS.

CAMBRIDGE UNIVERSITY PRESS
London: FETTER LANE, E.C.
C. F. CLAY, Manager

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Part of a transverse section of a Permian Osmundaceous Fern stem, Thamnopteris Schlechtendalii (Eichwald). a, outer xylem; b, inner xylem. For description, see [page 329]. (After Kidston and Gwynne-Vaughan. Very slightly reduced.)