A new sphenopsid cone from Iowa

Annals of Botany



A new Pennsylvanian cone genus (Litostrobus iowensis, n. gen., n. sp.), apparently of sphenophyllalean affinity, is described on the basis of a coal-ball specimen from the Urbandale Mine, Urbandale, Iowa. The cone is small and extremely simple in organization. It consists of superposed whorls of twelve bracts each. The bases of the bracts are fused to form shallow cuplike discs. Six sporangia are produced in each whorl; they are erect, each terminating a short, thick, axillary pedicel. Small spores with highly distinctive ornamentation are present in the sporangia.Comparison with other previously described sphenopsid fructifications reveals morphological differences that warrant recognition of the Urbandale specimen as a new genus.

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Publication type Article
Publication Subtype Journal Article
Title A new sphenopsid cone from Iowa
Series title Annals of Botany
DOI 10.1093/oxfordjournals.aob.a083392
Volume 18
Issue 2
Year Published 1954
Language English
Publisher Oxford University Press
Description 11 p.
First page 229
Last page 239
Country United States
State Iowa
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