Le Bayet

Azay-le-Rideau, France
Azay-le-Rideau, France
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The authors give a detailed description of Saccobolus obscuras, after a very recent gathering. This little discomycete, rarely cited in literature, possesses the feature of not being strictly coprophilous as the other members of this genus. © 2010 Adac. Tous droits réservés.

Ronikier A.,Polish Academy of Sciences | Lado C.,Real Jardin Botanico | Meyer M.,Le Bayet | de Basanta D.W.,Real Jardin Botanico
Mycologia | Year: 2010

As a result of the revision of European and American collections of genus Lamproderma two new nivicolous myxomycete species, Lamproderma argenteobrunneum and L. kowalskii, are described. The new species are characterized by the silvery-brown sporothecae, the areolate peridium and the ferruginousbrown spores in mass. They differ from one another mainly in spore size and ornamentation, the form of the capillitium and the stalk length and ratio of the stalk length to the total height of the sporocarp. The morphology of the new species was examined with light microscopy and scanning electron microscopy (SEM), and micrographs of relevant details are included. Lamproderma argenteobrunneum also was obtained in moist chamber culture, and the mature sporocarps displayed all features typical of fieldcollected samples. The known geographical distribution of L. argenteobrunneum includes the main ranges of the European alpine system (Alps, Carpathians, Pyrenees) as well as those of North America, while L. kowalskii has been recorded so far from several sites in California in the United States. © 2010 by The Mycological Society of America.

Fiore-Donno A.M.,University of Greifswald | Novozhilov Y.K.,Russian Academy of Sciences | Meyer M.,Le Bayet | Schnittler M.,University of Greifswald
PLoS ONE | Year: 2011

Plasmodial slime molds (Myxogastria or Myxomycetes) are common and widespread unicellular organisms that are commonly assumed to have a sexual life cycle culminating with the formation of often macroscopic fruiting bodies that efficiently disseminate spores. However, laboratory studies based on mating compatibility revealed the coexistence of asexual as well as sexual strains. To test this hypothesis in natural populations, we investigated the genetic variability of two species of the genus Lamproderma. Detailed ecological relevés were carried out in 2007 and 2009 in several deep ravines in the Elbsandsteingebirge (Saxony, south-eastern Germany). Morphological characters of 93 specimens of Lamproderma were recorded and genetic analyses, based on the small subunit ribosomal gene, the internal transcribed spacer 1 and partial elongation factor 1α sequences were carried out for 52 specimens. Genetic analyses showed the existence of two major clades, each composed of several discrete lineages. Most of these lineages were composed of several identical sequences (SSU, ITS 1 and EF-1α) which is explained best by an asexual mode of reproduction. Detrended Correspondence Analysis of morphological characters revealed two morphospecies that corresponded to the two major clades, except for one genotype (Lc6), thus challenging the morphospecies concept. Genetic patterns were not related to the geographical distribution: specimens belonging to the same genotype were found in distinct ravines, suggesting effective long-distance dispersal via spores, except for the Lc6 genotype which was found only in one ravine. Implications for the morphological and biological species concept are discussed. © 2011 Fiore-Donno et al.

Fiore-Donno A.M.,University of Oxford | Fiore-Donno A.M.,University of Greifswald | Fiore-Donno A.M.,University of Cologne | Clissmann F.,University of Greifswald | And 3 more authors.
PLoS ONE | Year: 2013

Myxomycetes, or plasmodial slime-moulds, are one of the largest groups in phylum Amoebozoa. Nonetheless, only ~10% are in the database for the small subunit (SSU) ribosomal RNA gene, the most widely used gene for phylogenetics and barcoding. Most sequences belong to dark-spored Myxomycetes (order Fuscisporida); the 318 species of superorder Lucisporidia (bright-spored) are represented by only eleven genuine sequences. To compensate for this, we provide 66 new sequences, 37 SSU rRNA and 29 elongation factor 1-alpha (EF-1α), for 82% of the genera of Lucisporidia. Phylogenetic analyses of single- and two-gene alignments produce congruent topologies and reveal both morphological characters that have been overemphasised and those that have been overlooked in past classifications. Both classical orders, Liceida and Trichiida, and several families and genera are para/polyphyletic; some previously unrecognised clades emerge. We discuss possible evolutionary pathways. Our study fills a gap in the phylogeny of Amoebozoa and provides an extensive SSU rRNA sequence reference database for environmental sampling and barcoding. We report a new group I intron insertion site for Myxomycetes in one Licea. © 2013 Fiore-Donno et al.

Kamono A.,Hokkaido University | Meyer M.,Le Bayet | Cavalier-Smith T.,University of Oxford | Fukui M.,Hokkaido University | And 2 more authors.
FEMS Microbiology Ecology | Year: 2013

In spite of the ecological importance of protists, very little data is available on their distribution in soil. This investigation is the first of its kind on what could be the major components of the soil protistan community, the Myxomycetes, or plasmodial slime-moulds, a monophyletic class in the phylum Amoebozoa. Myxomycetes have a complex life cycle culminating in the formation of mainly macroscopic fruiting bodies, highly variable in shape and colour, which can be found in every terrestrial biome. Despite their prevalence, they are paradoxically absent from environmental DNA sampling studies. We obtained myxomycete SSU rRNA gene sequences from soil-extracted RNAs using specific primers. Soil samples were collected in three mountain ranges (France, Scotland and Japan). Our study revealed an unexpectedly high diversity of dark-spored Myxomycetes, with the recovery of 74 phylotypes. Of these, 74% had < 98% identity with known sequences, showing a hidden diversity; there was little overlap between localities, implying biogeographical patterns. Few phylotypes were dominant and many were unique, consistent with the 'rare biosphere' phenomenon. Our study provides the first detailed insight into the community composition of this ecologically important group of protists, establishing means for future studies of their distribution, abundance and ecology. © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

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