Note on different kinds of attachments in trigonocarpalean (Medullosales) ovules from the Pennsylvanian Sydney Coalfield, Canada

Zodrow, Erwin L.

doi:10.4138/1039

Cited by 12 publications

(6 citation statements)

References 5 publications

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“…The hexagonal symmetry exists both in respect to ribs and commissures, where the latter bisect the major ribs (Figs 22C, 23B). Several overprinted or juxtaposed ovules were also found (see Zodrow 2004).…”

Section: Ovulesmentioning

confidence: 97%

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

Zodrow¹,

Tenchov²,

Cleal³

2007

Bull. Geosci.

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The foliar morphospecies Linopteris obliqua (Bunbury) Zeiller, 1899 was originally based on isolated pinnules from Middle Pennsylvanian (upper Westphalian) strata in the Sydney Coalfield in Nova Scotia, Canada. However, new finds from the type area, including segments of a cauline axis and some fronds, attached juvenile croziers, an attached ovule, and associated pre-pollen organ, allow for a more complete understanding of the whole Linopteris obliqua plant. It was arborescent, 9 m to 10 m tall, with fronds ca 7 m long. Ovules of the Hexagonocarpus-type were attached directly to the petiole near the base of the frond, and pre-pollen was produced by Potoniea-type structures. The plant produced seeds and pollen at different times to avoid self-pollination. Ovule production was periodic and accompanied by mass pinnule abscission. The venation, especially the areolate-vein geometry, is relatively invariable within the plant species, and thus provides the typus (blueprint) for distinguishing other linopterid species, especially when combined with two-dimensional probability surfaces, and traditional pinnule morphology. However, the venation must be viewed on the abaxial surface of the pinnules if it is to be reliably interpreted. The mode of vein reticulation is shown to be quite distinct from the anastomosis-pattern seen in the other medullosalean taxa, and is another character that separates the Potonieaceae from the rest of the order

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Section: Ovulesmentioning

confidence: 97%

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

Zodrow¹,

Tenchov²,

Cleal³

2007

Bull. Geosci.

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“…Boyce (2005) argued that the medullosalean seed fern morphology, in which the reproductive structures are integrated in the fronds (for example, Zodrow 2004), places limitations on the morphological variability of these fronds. In geologically younger seed fern clades, such as the Peltaspermales, in which reproductive organs have become separate from the vegetative parts of the plant, leaf shape would no longer be limited by the dual vegetative/reproductive role.…”

Section: Discussionmentioning

confidence: 99%

The Jambi gigantopterids and their place in gigantopterid classification

Booi

Waveren

Cittert

2009

Botanical Journal of the Linnean Society

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The gigantopterids are a pan-palaeotropical Late Palaeozoic (to Early Mesozoic) plant group with unknown affiliations. Two gigantopterid species, both sole representatives of their respective genera, are known from the Early Permian Mengkarang Formation of Jambi (Sumatra, Indonesia). Through an emendation of the Jambi gigantopterids, based on the old and newly collected material, and a subsequent analysis of the leaf morphology of several gigantopterid genera, we conclude that the Jambi species are similar to the other gigantopterids, but do not appear to be related to them directly. We propose a possible scenario for the evolution of gigantopterid leaf morphology, based on marginal leaf growth, with implications for the validity of the gigantopterids as a natural group.

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“…Although the seeds are almost invariably associated with Neuropteris flexuosa, the dimensions are altogether larger than seeds of this plant (Zodrow and McCandlish, 1980). Instead, the source may have been Alethopteris serlii, as this fossilgenus bore unusually large seeds (Zodrow, 2004(Zodrow, , 2007.…”

Section: Medullosalean Seedsmentioning

confidence: 95%

A Middle Pennsylvanian macrofloral assemblage from below the Rock Island (No. 1) Coal Member, Illinois: Resolving the Bolsovian–Asturian boundary in the Illinois Basin

Bashforth

Nelson

2015

Review of Palaeobotany and Palynology

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A taxonomic, quantitative, and biostratigraphic analysis is presented for a macrofloral assemblage collected from below the Rock Island (No. 1) Coal Member at the historical Friendship Farm locality in Rock Island County, on the northwestern margin of the Illinois Basin. The Middle Pennsylvanian (middle Moscovian) fossiliferous strata involve the middle Tradewater Formation, and are situated a short distance below the Atokan-Desmoinesian Stage boundary as defined by marine microfossils and palynology. The assemblage of 14 fossil-taxa is overwhelmingly dominated by pteridosperms, including Laveineopteris rarinervis, Neuropteris flexuosa, Alethopteris serlii, Macroneuropteris scheuchzeri, and Mariopteris nervosa, whereas lycopsids, sphenopsids, and ferns are comparatively rare. Homotaxial comparison with the macrofloral biozonation scheme established in Europe indicates an Asturian age for the assemblage, in all likelihood early Asturian (Linopteris obliqua Biozone). Similar comparisons with range limits documented in the Appalachian Basin yield a more ambiguous age, but an early Asturian age is equally probable. These findings indicate that the Bolsovian-Asturian Substage boundary of western Europe lies below the Atokan-Desmoinesian Stage boundary in the Illinois Basin, boundaries that have traditionally been correlated by palynology. The Middle Pennsylvanian interval near these boundaries is being increasingly recognized as one of significant environmental change, reflected in marked lithological and biological modifications throughout tropical Euramerica. However, the fact that the Bolsovian-Asturian and Atokan-Desmoinesian boundaries are not synchronous, albeit being broadly equivalent, suggests that the environmental perturbation was a protracted event that may have had global consequences.

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Note on different kinds of attachments in trigonocarpalean (Medullosales) ovules from the Pennsylvanian Sydney Coalfield, Canada

Cited by 12 publications

References 5 publications

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

The arborescent Linopteris obliqua plant (Medullosales, Pennsylvanian)

The Jambi gigantopterids and their place in gigantopterid classification

A Middle Pennsylvanian macrofloral assemblage from below the Rock Island (No. 1) Coal Member, Illinois: Resolving the Bolsovian–Asturian boundary in the Illinois Basin

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