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III.—Some Specimens of Cladoxylon from the Calciferous Sandstone Series of Berwickshire

Published online by Cambridge University Press:  06 July 2012

Albert G. Long
Albert G. Long
Affiliation:
Hancock Museum, Newcastle upon Tyne.
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Synopsis

Cladoxylon waltoni sp. nov. is described from stems resembling C. radiatum Unger in the form of stele and absence of secondary xylem, but differing in the mode of emission of clepsydroid leaf-traces. Each leaf-trace originates as a band of xylem connecting two adjacent xylem arms. Dorsiventral axes with an ornate U-shaped bundle and 4-9 radiating arms are also included in the species. These give off alternate clepsydroid traces from two or three adjacent arms in a manner resembling a rachis. One specimen of Hierogramma mysticum Unger is described and three small rachides are interpreted as possible subdivisions of a Hierogramma frond.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 68 , Issue 3 , 1968 , pp. 45 - 61
Copyright
Copyright © Royal Society of Edinburgh 1968

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