Robertozyma Q.M. Wang & F.Y. Bai, 2020

Li, A. - H., Yuan, F. - X., Groenewald, M., Bensch, K., Yurkov, A. M., Li, K., Han, P. - J., Guo, L. - D., Aime, M. C., Sampaio, J. P., Jindamorakot, S., Turchetti, B., Inacio, J., Fungsin, B., Wang, Q. - M. & Bai, F. - Y., 2020, Diversity and phylogeny of basidiomycetous yeasts from plant leaves and soil: Proposal of two new orders, three new families, eight new genera and one hundred and seven new species, Studies In Mycology 96, pp. 17-140 : 116

Robertozyma Q.M. Wang & F.Y. Bai gen. nov. MycoBank MB828824.

Etymology: the genus is named in honour of Dr. V. Robert for his contributions to the yeast taxonomy.

This genus is proposed for the branch represented by strain CGMCC 2.4451 which formed a separate clade. Member of the Cystobasidiales ( Cystobasidiomycetes). The genus is mainly circumscribed by the phylogenetic analysis of the seven genes dataset, in which it occurred as a separate branch within the Cystobasidiales ( Fig. 4 ).

Sexual reproduction not known. Colonies orange, butyrous. Budding cells present. Pseudohyphae and hyphae not produced. Ballistoconidia not formed.

Type species: Robertozyma ningxiaensis Q.M. Wang, F.Y. Bai & A.H. Li.

Note: Robertozyma and its closely related genera, Begerowomyces and Halobasidium , have a similar colony morphology, however, they can be distinguished by some physiological characters ( Table S1.27 ). Robertozyma does not assimilate sucrose, melezitose, D-xylose and ethanol, whereas species of Begerowomyces and Halobasidium can use them. Begerowomyces species assimilate erythritol and galactitol, whereas species of Robertozyma and Halobasidium do not assimilate these two carbon resources.

Figures

Fig. 4. Phylogenetic tree inferred using the combined sequences of RPB1, RPB2, TEF1, CYTB, SSU rDNA, LSU rDNA D1/D2 domains and 5.8S rDNA, depicting the phylogenetic positions of new taxa (in bold) within Pucciniomycotina. The tree backbone was constructed using maximum likelihood analysis. Bootstrap percentages of maximum likelihood analysis over 50 % from 1 000 bootstrap replicates and posterior probabilities of Bayesian inference above 0.9 are shown respectively from left to right on the deep and major branches. Bar = 0.2 substitutions per nucleotide position. Note: ns, not supported (BP <50 % or PP <0.9); nm, not monophyletic. The new taxa are in bold.