IV.—On the Fragmentary Remains of an Organism Referable to the Nematophytales, from the Rhynie Chert, <i>Nematoplexus rhyniensis</i> gen. et sp. nov.

Lyon, A. G.

doi:10.1017/s0080456800012382

Cited by 31 publications

(26 citation statements)

References 2 publications

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“…Those containing more than one kind of tube or filament can be assigned to genera of the Nematophytales Lang (e.g. Nematothallus Lang ( 1937), Nematoplexus Lyon ( 1962), Prototaxites Dawson ( 1859), or Nematosketum Burgess & Edwards ( 1988 Pratt et al, 1978: 131, p1.2, figs 5-8. 1982'black tube', Edwards, 1982: 242, fig.…”

Section: Methodsmentioning

confidence: 99%

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Classification of uppermost Ordovician to Lower Devonian tubular and filamentous macerals from the Anglo-Welsh Basin

Burgess

Edwards

1991

Botanical Journal of the Linnean Society

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Dispersed tubes and filaments from the uppermost Ordovician, Silurian and Lower Devonian of the Anglo‐Welsh Basin of Great Britain are described and classified using the artificial Anteturma system instituted for spores. The new Anteturma Trichomiformis is erected containing two new Turmae, Tubiformis and Filiformis. Within Tubiformis, the Infraturma Laevimurali, Endomurali and Extramurali are described, each containing a single genus with four, two and one species respectively. Within Filiformis, the Infraturma Ornatimurali is erected, based on a monospecific genus. Two assemblages of tubes and filaments are recognized. The older is found in uppermost Ordovician through to middle Silurian strata and is typified by a low diversity of smooth‐walled tubes. The younger ranges from the middle Silurian at least to the Lower Devonian and is typified by various smooth‐walled tubes, tubes with internal and external thickenings, and filaments. The majority of tubes and filaments are considered derived from the Nematophytales Lang.

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Section: Methodsmentioning

confidence: 99%

“…Tubes of similar morphology are a component of the nematophytalean wefts Nematoplexus rhyniensis Lyon, 1962 andNematothallus spp. Burgess ( 1987) indicating a nematophytalean origin for perhaps all specimens of Porcatitubulus annulatus.…”

Section: Porcatitubulus Annulatusmentioning

confidence: 99%

Classification of uppermost Ordovician to Lower Devonian tubular and filamentous macerals from the Anglo-Welsh Basin

Burgess

Edwards

1991

Botanical Journal of the Linnean Society

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“…Lyon 1962;Edwards 1973) obtained reasonably good acetate peels of organic material after etching cut surfaces with hydrofluoric acid (HF). Lyon 1962;Edwards 1973) obtained reasonably good acetate peels of organic material after etching cut surfaces with hydrofluoric acid (HF).…”

Section: Silicification and Taphonomymentioning

confidence: 99%

A review of the palaeoenvironments and biota of the Windyfield chert

Fayers

Trewin

2003

Transactions of the Royal Society of Edinburgh: Earth Sciences

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The Windyfield chert site is located 700 m NE of the original Rhynie chert locality at Rhynie, Aberdeenshire, Scotland. Originally identified by concentrations of surface float material, a drilling and trenching programme of the area in 1997 revealed a chert 'pod' in situ interbedded with fluvial/lacustrine sandstones and hydrothermally altered shales. Chert morphologies identified from float blocks and trench material range from tabular beds to lenticular pods displaying massive, nodular, laminated and brecciated fabrics, and geyserite splash textures. A suite of floral and faunal associations, when combined with distinctive macro-and microscopic chert textures, has been used to interpret depositional conditions. Palaeoenvironments ranged from terrestrial laminated, brecciated and vegetated sinter sheets to low-temperature pools and marginal aquatic settings. The flora comprises six higher land plant species, nematophytes, charophytes, various fungi and probable cyanobacteria. Arthropods include branchiopod crustaceans, a euthycarcinoid, trigonotarbid arachnids, centipedes, eoarthropleurids and a possible hexapod. The biota of the Windyfield chert is closely comparable to that found in the Rhynie chert. Together, the Windyfield and Rhynie cherts contain the most diverse associated fossil arthropod fauna of terrestrial and freshwater origin from rocks of comparable age anywhere in the world.

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“…Another plant of this same general type described from the Rhynie Chert is Nematoplexus (Lyon, 1962). It consists of non-septate tubes of two sizes, much like those of Prototaxites (Figs.…”

Section: Fossil Recordmentioning

confidence: 97%

“…For example, the discovery of cauline sporangia attached to stems of Asteroxylon (Lyon, 1964) resulted in the realization that this plant possessed features more closely associated with lycophytes, while in Horneophyton (Fig. 22), several characters have been used to suggest affinities with a bryophytic level of evolution (e.g., Taylor, 1982)…”

Section: Rhynie Chert Plantsmentioning

confidence: 99%

The Origin of Land Plants: Some Answers, More Questions

Taylor

1988

TAXON

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryThe discovery of new fossil plant remains, together with new interpretations of previously described forms, suggests that some ideas regarding the origin of land plants need to be modified. Some evidence suggests that perhaps plants with a bryophytic level of organization were on the land as early as the Ordovician. This suggestion is strengthened by a number of Devonian plants that lack tracheids despite possessing a suite of morphological features generally attributed to vascular plants. Such information necessitates that the current classification of early land plants be re-examined, together with ideas about the origin and subsequent evolution of vascular plants and bryophytes. IntroductionOne of the most interesting and intriguing topics in paleobiology today centers on the origin of a terrestrial flora (e.g., Gensel and Andrews, 1987). Since the first plants that possessed conducting cells in the form of tracheids were found in Devonian sediments, speculation has continued regarding possible land plant progenitors and the many ancillary questions associated with these speculations. It is perhaps safe to say that today there are nearly as many points of view on stages and events in the colonization of the land surface by plants as there are researchers speculating on the steps involved. What is perhaps most important, however, is the fact that the questions associated with "the first land plants" and where they came from are today being approached from many different perspectives. In recent years there has been a rather decided shift in many areas of paleobiology to the incorporation of a more biological perspective, while at the same time the realization has grown that the solution to many problems in plant evolution requires far more than a cursory understanding of the earth sciences. Approaches that are being used today range from analyzing chloroplast 4.5S and 5S rRNA sequences (e.g., Hori et al., 1985;Bobrova et al., 1987) to the incorporation of cladistic analyses as a method to visualize more clearly land plant ancestors and the points of separation of major groups (e.g., Mishler andChurchill, 1984, 1985;Sluiman, 1985). Others have utilized information about the size of vascular elements, thickness of cuticle, size and frequency of stomata and available surface area to hypothesize levels of physiological adaptation during the evolution of land plants (e.g., Raven, 1977Raven, , 1984. In another line of investigation, Chapman (1985) suggests that 02 had to reach a particular level for the synthesis of lignin, ultimately involved in the...

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IV.—On the Fragmentary Remains of an Organism Referable to the Nematophytales, from the Rhynie Chert, Nematoplexus rhyniensis gen. et sp. nov.

Cited by 31 publications

References 2 publications

Classification of uppermost Ordovician to Lower Devonian tubular and filamentous macerals from the Anglo-Welsh Basin

Classification of uppermost Ordovician to Lower Devonian tubular and filamentous macerals from the Anglo-Welsh Basin

A review of the palaeoenvironments and biota of the Windyfield chert

The Origin of Land Plants: Some Answers, More Questions

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