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  • Title: Molecular phylogeny of basidiomycetous yeasts in the Cryptococcus luteolus lineage (Tremellales) based on nuclear rRNA and mitochondrial cytochrome b gene sequence analyses: proposal of Derxomyces gen. nov. and Hannaella gen. nov., and description of eight novel Derxomyces species.
    Author: Wang QM, Bai FY.
    Journal: FEMS Yeast Res; 2008 Aug; 8(5):799-814. PubMed ID: 18616607.
    Abstract:
    Phylogenetic relationships among the hymenomycetous yeasts in the Cryptococcus luteolus lineage of the Tremellales were examined based on sequence analyses of the 18S rRNA gene, 26S rRNA gene D1/D2 domain, internal transcribed spacer (ITS) region including 5.8S rRNA gene and mitochondrial cytochrome b gene. In addition to the Dioszegia clade, two clades represented by Bullera mrakii and Bullera sinensis, respectively, were revealed to be well-separated monophyletic groups in the lineage. These clades also exhibited distinguishable colony characters. Two new genera, Derxomyces gen. nov. (type species: Derxomyces mrakii comb. nov.) and Hannaella gen. nov. (type species: Hannaella sinensis comb. nov.), are proposed to accommodate the species in the B. mrakii and B. sinensis clades, respectively. Mainly based on D1/D2 and ITS sequence comparison, eight novel Derxomyces species were recognized from ballistoconidium-forming strains isolated from plant leaves. The new species and their type strains are as follows: Derxomyces boekhoutii (AS 2.3758(T)=CBS 10824(T)), Derxomyces hainanensis (AS 2.3467(T)=CBS 10820(T)), Derxomyces linzhiensis (AS 2.2668(T)=CBS 10827(T)), Derxomyces pseudocylindrica (AS 2.3778(T)=CBS 10826(T)), Derxomyces qinlingensis (AS 2.2446(T)=CBS 10818(T)), Derxomyces simaoensis (AS 2.3571(T)=CBS 10822(T)), Derxomyces wuzhishanensis (AS 2.3760(T)=CBS 10825(T)) and Derxomyces yunnanensis (AS 2.3562(T)=CBS 10821(T)).
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