A5033722527- Plant Diversity and Evolution
- Paleontology and Stratigraphy of Fossils
- Plant and Fungal Species Descriptions
- Fern and Epiphyte Biology
- Geology and Paleoclimatology Research
- Geological formations and processes
- Mediterranean and Iberian flora and fauna
- Ecology and Vegetation Dynamics Studies
- Paleontology and Evolutionary Biology
- Evolution and Paleontology Studies
- Geological and Geophysical Studies
- Botanical Research and Applications
- Botany and Plant Ecology Studies
- Polar Research and Ecology
- Plant Taxonomy and Phylogenetics
- Plant Parasitism and Resistance
- Plant and animal studies
- Botany, Ecology, and Taxonomy Studies
- Plant Water Relations and Carbon Dynamics
- Geological and Geochemical Analysis
- Tree Root and Stability Studies
- Pasture and Agricultural Systems
- Forest ecology and management
- Plant and Biological Electrophysiology Studies
- Biocrusts and Microbial Ecology
UMR Botanique et Modélisation de l’Architecture des Plantes et des végétations
2015-2024
Centre de Coopération Internationale en Recherche Agronomique pour le Développement
2011-2024
Institut de Recherche pour le Développement
2017-2024
Centre National de la Recherche Scientifique
2014-2024
Université de Montpellier
2015-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020-2022
Institut Agro Montpellier
2019-2022
American Museum of Natural History
2009-2021
University of Kansas
2007-2021
Abstract Araucarioxylon Kraus is a widely known fossil‐genus generally applied to woods similar that of the extant Arau‐ cariaceae. However, since 1905, several researchers have pointed out this name an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood type: Agathoxylon Hartig, , Dadoxylon Endl. and Dammaroxylon J. Schultze‐Motel. This problem inconsistent application compounded by fact type represent wide range plants including basal...
Abstract This paper reviews information on the Devonian trees that evolved in euphyllophyte clade with special focus Middle Pseudosporochnales. The morphology of pseudosporochnalean shows analogies extant tree ferns, including possession an adventitious root system limited extent at base trunk. Direct evidence how these were constructed is scarce. We propose a growth model integrating from younger representatives same class known to reach large diameters. According this model, trunk width...
We present a whole-plant concept for genus of voltzialean conifers on the basis compression/impression and permineralized material from Triassic Antarctica. The reconstruction individual organs is based combination organic connections, structural correspondences, similarities in cuticles epidermal morphologies, co-occurrence data, ex situ palynology. affiliated genera include trunks, branches, roots (Notophytum); strap-shaped leaves with parallel venation (Heidiphyllum compressions...
Abstract: It is usually considered that after the extinction of Devonian tree Archaeopteri s, no new arborescent lignophytes were established before late Tournaisian. A reassessment this pattern presented here based on a three-fold approach: re-evaluation taxic diversity Tournaisian lignophyte trees descriptions plants from palaeotropical latitudes, study patterns phenotypic changes occurring among early using principal coordinate analysis and phylogenetic affinities taxa. The best supported...
The seed cone Telemachus is known from several Triassic localities in Gondwana. New specimens two Antarctica provide additional information about the type species, elongatus, based on details of morphology and anatomy revealed by using a modified transfer technique compressed plants. Seed cones T. elongatus are up to 6.0 cm long characterized conspicuous, elongate bracts. A second Antarctic described here as antarcticus, segregated, shorter bract differences size. Newly recognized features...
Premise of research. Well-preserved Triassic plant fossils from Antarctica yield insights into the physiology growth under seasonal light regimes warm polar forests, a type ecosystem without any modern analogue. Among many well-known plants is enigmatic Petriellaea triangulata, dispersed seedpod structure that considered possible homologue angiosperm carpel. However, morphology and produced these seedpods have so far remained largely elusive.Methodology. Here, we describe petriellalean stems...
Permineralized Vertebraria roots from the late Permian of Central Transantarctic Mountains, Antarctica, are investigated to understand unusual vascular anatomy genus. The specimens range ∼1 mm several centimeters in diameter and illustrate all stages secondary growth. Our observations confirm previous hypotheses on development these suggest that their unique is result a change developmental timing. characterized by cambium remains discontinuous through growth seasons, leading formation...
The evolutionary history of lignophyte roots is poorly known, and direct evidence root systems in early members this clade scant. Whereas Middle Devonian aneurophytalean progymnosperms possessed rhizomatous stems bearing small, shallow roots, the system archaeopteridalean trees expected to have been much more extended complex. Current evidence, however, has not provided sufficient information for substantiating these expectations. Five specimens with a Callixylon anatomy were found Late...
The leaf longevity of trees, deciduous or evergreen, plays an important role in climate feedbacks and plant ecology. In modern forests the high latitudes, evergreen trees dominate; however, fossil record indicates that vegetation dominated during some previous warm intervals. We show, through integration palaeobotanical techniques isotope geochemistry one earliest polar (Late Permian, c . 260 Ma, Antarctica), arborescent glossopterid taxa were both with a greater abundance occurring studied...
ABSTRACT Studies of anatomically preserved fossils provide a wealth information on the evolution plant vascular systems through time, from oldest evidence plants more than 400 million years ago to rise modern angiosperm-dominated flora. In reviewing key contributions fossil record, we discuss knowledge gaps and major outstanding questions about processes attending systems. The appearance diversification early in late Silurian-Devonian was accompanied by different types tracheids, which...
Mycorrhizal root nodules occur in the conifer families Araucariaceae, Podocarpaceae, and Sciadopityaceae. Although fossil record of these can be traced back into early Mesozoic, oldest evidence previously came from Cretaceous. Here we report on cellularly preserved Notophytum Middle Triassic permineralized peat Antarctica. These contain fungal arbuscules, hyphal coils, vesicles their cortex. Numerous glomoid-type spores are found matrix surrounding nodules. This discovery indicates that...
Two anatomically preserved gymnosperm trunks with clusters of epicormic shoots are described from the Late Permian Antarctica. The best‐preserved trunk is 14 cm long. It has a small circular parenchymatous pith and 9 secondary xylem that contains at least 50 growth rings. second specimen slightly smaller ($$11\times 8$$ cm) 20 Both specimens have pycnoxylic wood produced more than in delimited zone on surface trunk. Shoots wide may be solid to septate endarch primary forming 8–10 sympodia...
It should not be surprising that there are numerous examples of fossil organisms for which no known direct modern analogues. The seed ferns the Paleozoic and Mesozoic, arborescent sphenophytes, a number Silurian Devonian sometimes placed in artificial group Nematophytales (19 or Nematophyta (27 represent such organisms. These either combine morphological anatomical features found biota constructed differently from any other living life form (10. nematophytes undoubtedly among latter, biology...
Our knowledge of the evolution secondary phloem and periderm anatomy in early lignophytes (progymnosperms seed plants) is limited by scarcity well-preserved fossil bark. Here, I describe bark a Mississippian (Early Carboniferous) tree from Australia based on macro- microscopic observation two permineralized specimens. The tissues are up to 1.5 cm thickness. organized repeated, multicellular tangential layers fibers thin-walled cells that correspond axial parenchyma sieve cells. Fibers...
• Premise of the study: During Devonian, evolution secondary phloem produced by a bifacial vascular cambium was key innovation that increased ability plants within lignophyte clade to redistribute photosynthates and other organic compounds throughout their body. Unraveling anatomy first arborescent lignophytes is crucial understand this tissue physiology early trees. Methods: A 10 cm wide stem Callixylon with preserved from Famennian Morocco described using thin‐sections. Key results: The...