Tremella saccharicola f.a., sp. nov., a novel tremellaceous yeast species isolated from tropical regions

Tremella ananatis sp. nov. and Tremella lamprococci sp. nov., two yeast species associated with bromeliads

Eight yeast isolates with an affinity to the genus Tremella were obtained from bromeliads from different locations in Brazil. Although the formation of basidia and basidiocarp were not observed, on the basis of the results of sequence analysis of the D1/D2 domain of the large subunit (LSU) rRNA gene and internal transcribed spacer (ITS) region, we suggest that these isolates represent two novel species of the genus Tremella. These yeasts are phylogenetically related to Tremella saccharicola and Tremella globispora. Therefore, we propose Tremella ananatis sp. nov. and Tremella lamprococci sp. nov. as novel yeast species of the order Tremellales (Agaricomycotina, Basidiomycota). Sequence analysis revealed that Tremella ananatis sp. nov. differs by 11 and 28 nucleotide substitutions from Tremella saccharicola in the D1/D2 sequence and ITS region, respectively. Moreover, Tremella lamprococci sp. nov. differs by 15 and 29 nucleotide substitutions from Tremella globispora in the D1/D2 sequence and ITS region, respectively. The holotypes of Tremella ananatis sp. nov. and Tremella lamprococci sp. nov. are CBS 14568T and CBS 14567T, and the MycoBank numbers are MB840480 and MB840481, respectively.

Four new species in the Tremellafibulifera complex (Tremellales, Basidiomycota)

Samples of species close to Tremellafibulifera from China and Brazil are studied, and T.fibulifera is confirmed as a species complex including nine species. Five known species (T.cheejenii, T.fibulifera s.s., T. “neofibulifera”, T.lloydiae-candidae and T.olens) and four new species (T.australe, T.guangxiensis, T.latispora and T.subfibulifera) in the complex are recognized based on morphological characteristics, molecular evidence, and geographic distribution. Sequences of eight species of the complex were included in the phylogenetic analyses because T.olens lacks molecular data. The phylogenetic analyses were performed by a combined sequence dataset of the internal transcribed spacer (ITS) and the partial nuclear large subunit rDNA (nLSU), and a combined sequence dataset of the ITS, partial nLSU, the small subunit mitochondrial rRNA gene (mtSSU), the translation elongation factor 1-α (TEF1), the largest and second largest subunits of RNA polymerase II (RPB1 and RPB2). The eight species formed eight independent lineages with robust support in phylogenies based on both datasets. Illustrated description of the six species including Tremellafibulifera s.s., T. “neofibulifera” and four new species, and discussions with their related species, are provided. A table of the comparison of the important characteristics of nine species in the T.fibulifera complex and a key to the whitish species in Tremella s.s. are provided.

Phaeotremella camelliae sp. nov. (Phaeotremellaceae, Tremellales), A Novel Yeasts Isolated from Tea-Oil Fruits in Jiangxi Province, China

Sixty-two isolates among the 65 yeast strains isolated from Jiangxi province, China, were identified into 15 known species based on the sequence analysis of the D1/D2 domains of the LSU rRNA and ITS region. The other three strains, GaoanZ14, GaoanC57, and GaoanC191, isolated from tea-oil fruits, were identified as two undescribed species of Phaeotremella based on the multiple gene sequence analysis, physiological, and biochemical comparisons. Strains GaoanC57 and GaoanC191 had one substitution difference both in the D1/D2 domains of the LSU rRNA and ITS region. They formed a separate branch from the other Phaeotremella species in the D1/D2 and multiple genes trees, and differed from the known species by at least 10 nucleotide substitutions in the D1/D2 domains and more than 6% mismatches in the ITS region. The phylogenetic analysis indicated that those two strains represent a novel species of Phaeotremella, for which the names Phaeotremella camelliae sp. nov. (Holotype CGMCC 2.6141, Mycobank MB832699) is proposed. Only one strain, GaoanZ14, represents the other undescribed species of Phaeotremella, so it will be described in latter when more strains are found.