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The oaks of western Eurasia: Traditional classifications and evidence from two nuclear markers
Phylogenetic reconstructions suggest two major lineages within Quercus, each consisting of three infrageneric groups, which evolved by "budding" as is reflected by incomplete lineage sorting, high variability within groups, and low differentiation among groups.
Significance of Pollen Characteristics for Infrageneric Classification and Phylogeny in Quercus (Fagaceae)
  • T. Denk, G. Grimm
  • Biology
    International Journal of Plant Sciences
  • 1 September 2009
Pollen ornamentation is a most valuable tool to identify members of the major infrageneric groups in Quercus and provides the basis for a reevaluation of the fossil record of quercus.
Phase-contrast X-ray microtomography links Cretaceous seeds with Gnetales and Bennettitales
Over the past 25 years the discovery and study of Cretaceous plant mesofossils has yielded diverse and exquisitely preserved fossil flowers that have revolutionized our knowledge of early
An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns
This chapter proposes an updated classification of Quercus recognising two subgenera with eight sections, and considers morphological traits, molecular-phylogenetic relationships, and the evolutionary history of one of the most important temperate woody plant genera.
Reliability and resolution of the coexistence approach — A revalidation using modern-day data
It is shown that CA/PFDB is unable to reliably reconstruct the actual climates of most of the releves analysed, rendering the coexistence approach useless for the quantitative reconstruction of palaeoclimate and calls for alternative approaches of investigating past climates by means of fossil plants.
Geographical distribution of cryptic genetic types in the planktonic foraminifer Globigerinoides ruber
The results suggest that the geographical scale of mutual exclusion between the genotypes is negatively correlated with their phylogenetic relatedness: the most similar and most recently diverged pair of siblings showed the strongest evidence for small‐scale competitive exclusion.
Harvesting Betulaceae sequences from GenBank to generate a new chronogram for the family
The fossil record and molecular clocks calibrated with alternating fossils indicate that the stem lineage of Betulaceae dates back to the Upper Cretaceous, the two subfamilies to the Palaeocene and the most recent common ancestors of each of the living genera to the mid- to late Miocene.
A concern remains that monoecy in Acer might not always be distinguishable from labile sex expression, which needs to be addressed by long-term monitoring of monoecious trees, as well as phylogenetically disparate clades that date back to the Late Eocene and Oligocene.
Multiple nuclear genes stabilize the phylogenetic backbone of the genus Quercus
Using a dating approach, an Eocene age for the primary divergences in Quercus and a root age of about 50–55 Ma agrees with palaeobotanical evidence, indicating that morphological differentiation pre-dates genetic isolation in this clade.
Its evolution in Platanus (Platanaceae): homoeologues, pseudogenes and ancient hybridization.
It was found that putative non-functional ITS copies ('pseudogenes') form distinct groups in phylograms and splits graphs, and that pseudogenous lineages reflect ancient hybridization events conserved in the ITS.