Paleozoic seed ferns: Heterangium kentuckyensis sp. nov., from the Upper Carboniferous of North America.

K. B. Pigg; T. N. Taylor; R. A. Stockey

doi:10.2307/2444155

Paleozoic seed ferns: Heterangium kentuckyensis sp. nov., from the Upper Carboniferous of North America.

K. B. Pigg, T. N. Taylor, R. A. Stockey

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Heterangium kentuckeyensis sp. nov. is described from Lower/Middle Pennsylvanian sediments of eastern Kentucky, based on permineralized stems, petioles, frond members, laminar foliage, and roots, including several organs in attachment. The characters used to distinguish the subgenera of Heterangium are evaluated and found to be unreliable. Moreover, suggested phylogenetic schemes both within Heterangium and between this taxon and other lyginopterid pteridosperms based on these features are inconsistent with stratigraphic data. Until reproductive features are known, the classification of Heterangium species is best based on characters of the vegetative sporophyte, including stelar organization, cortical histology, and frond morphology. - from AuthorsKentucky new taxon

Original language	English (US)
Pages (from-to)	1184-1204
Number of pages	21
Journal	American Journal of Botany
Volume	74
Issue number	8
DOIs	https://doi.org/10.2307/2444155
State	Published - Jan 1 1987
Externally published	Yes

ASJC Scopus subject areas

Ecology, Evolution, Behavior and Systematics
Genetics
Plant Science

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title = "Paleozoic seed ferns: Heterangium kentuckyensis sp. nov., from the Upper Carboniferous of North America.",

abstract = "Heterangium kentuckeyensis sp. nov. is described from Lower/Middle Pennsylvanian sediments of eastern Kentucky, based on permineralized stems, petioles, frond members, laminar foliage, and roots, including several organs in attachment. The characters used to distinguish the subgenera of Heterangium are evaluated and found to be unreliable. Moreover, suggested phylogenetic schemes both within Heterangium and between this taxon and other lyginopterid pteridosperms based on these features are inconsistent with stratigraphic data. Until reproductive features are known, the classification of Heterangium species is best based on characters of the vegetative sporophyte, including stelar organization, cortical histology, and frond morphology. - from AuthorsKentucky new taxon",

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Paleozoic seed ferns: Heterangium kentuckyensis sp. nov., from the Upper Carboniferous of North America.

Abstract

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