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Verloove F.,National Botanic Garden of Belgium
Webbia | Year: 2010

Eleocharis pellucida J. Presl & C. Presl (Cyperaceae), native in south-eastern and eastern Asia, is reported for the first time as a xenophyte in Europe. It is locally abundant and well-naturalised in several heaths (baraggias) in the provinces of Biella, Torino and Vercelli (Piemonte, Italy) and possibly overlooked elsewhere. Diagnostic features are discussed and compared with those of related native and non-native species. An updated identification key for the genus Eleocharis in Piemonte as well as a photograph and an original line drawing are presented. Finally, the species' potential introduction history in Piemonte is discussed. Source


Peeters K.,Ghent University | Ertz D.,National Botanic Garden of Belgium | Willems A.,Ghent University
Systematic and Applied Microbiology | Year: 2011

We studied the culturable heterotrophic bacterial diversity present at the site of the new Princess Elisabeth Station at Utsteinen (Dronning Maud Land, East Antarctica) before construction. About 800 isolates were picked from two terrestrial microbial mat samples after incubation on several growth media at different temperatures. They were grouped using rep-PCR fingerprinting and partial 16S rRNA gene sequencing. Phylogenetic analysis of the complete 16S rRNA gene sequences of 93 representatives showed that the isolates belonged to five major phyla: Actinobacteria, Bacteroidetes, Proteobacteria, Firmicutes and Deinococcus-Thermus. Isolates related to the genus Arthrobacter were the most prevalent whereas the genera Hymenobacter, Deinococcus, Cryobacterium and Sphingomonas were also recovered in high numbers in both samples. A total of 35 different genera were found, the majority of which has previously been reported from Antarctica. For the genera Aeromicrobium, Aurantimonas, Rothia, Subtercola, Tessaracoccus and Xylophilus, this is the first report in Antarctica. In addition, numerous potential new species and new genera were recovered; many of them currently restricted to Antarctica, particularly in the phyla Bacteroidetes and Deinococcus-Thermus. © 2011 Elsevier GmbH. Source


Zidarova R.,Sofia University | Kopalova K.,Charles University | Van de Vijver B.,National Botanic Garden of Belgium
Phytotaxa | Year: 2012

During the ongoing revision of the non-marine diatom flora of Livingston Island (South Shetland Islands, Maritime Antarctic Region) the taxonomy and morphology of all Pinnularia taxa, excluding the section Distantes, present in the samples from Livingston Island, have been analysed. Seventeen different Pinnularia taxa have been recorded. Apart from those previously described from the Antarctic Region (P. subcapitata var. elongata, P. gemella, P. austroshetlandica) and the Andes (P. strictissima), thirteen unknown taxa have been found. Based on their unique morphological features, twelve are described as new in this paper: P. australodivergens sp. nov., P. australoglobiceps sp. nov., P. australomicrostauron sp. nov., P. australoschoenfelderi sp. nov., P. hamiltonii sp. nov., P. livingstonensis sp. nov., P. magnifica sp. nov., P. microstauroides sp. nov., P. pseudolaucensis sp. nov., P. sergiplaiana sp. nov., P. subcarteri sp. nov. and P. subaltiplanensis sp. nov. For one, only a few specimens have been found and at present they cannot be identified with 100% certainty. © 2012 Magnolia Press. Source


De Block P.,National Botanic Garden of Belgium
Phytotaxa | Year: 2014

Two new Ixora species from Madagascar are described, Ixora lagenifructa and I. quadrilocularis. Ixora littoralis, previously positioned in the monospecific genus Thouarsiora, is newly named I. homolleae. These three species are characterized by 4-locular ovaries and fruits, 4-lobed stigmas, large fruits with thick walls and well-developed calyces. A fourth species, I. trimera, shows the same characters but its ovaries are 2-, 3- or 4-locular and its stigmas are 2-, 3- or 4- lobed. A dichotomous key, detailed descriptions and distribution maps are given for these four species, the only multilocular ones in Madagascar. © 2014 Magnolia Press. Source


Ertz D.,National Botanic Garden of Belgium | Tehler A.,Enheten for Kryptogambotanik
Fungal Diversity | Year: 2011

A two-locus phylogenetic study of the order Arthoniales is presented here using the nuclear ribosomal large subunit (nucLSU) and the second largest subunit of RNA polymerase II (RPB2). This analysis is the first large phylogeny of this fungal group and includes 476 sequences and 240 specimens representing 132 species sampled from 31 genera (in their traditional circumscription). In addition to the previously recognized families (Arthoniaceae, Chrysothricaceae and Roccellaceae), three additional family-level groups are recovered, one being poorly supported. Therefore, the new family Roccellographaceae is described and the family Opegraphaceae is reinstated. Morphological characters such as growth form, fruit body type, exciple, hypothecium and ascospores colour, ascospores septation pattern, and chemistry are found to be of limited use in delimiting families and genera, which indicates an unusual level of plasticity in the Arthoniales. This high level of homoplasy might indicate that the Arthoniales is an old group with taxa having evolved in parallel for very long times. The genera Arthonia, Arthothelium, Chiodecton, Hubbsia, Ingaderia, Lecanactis, Lecanographa, Llimonaea, Opegrapha, Roccellina, Schismatomma and Sclerophyton were found paraphyletic. In order to make these genera monophyletic, the new genera Dimidiographa, Fulvophyton, Paraingaderia, Paralecanographa, Paraschismatomma and Sparria are newly described and the genera Alyxoria, Dictyographa and Zwackhia reinstated. The new species Lecanactis borbonica and Paraingaderia placodioidea are described. © 2011 Kevin D. Hyde. Source

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