Pseudonadsoniella brunnea
Pseudonadsoniella brunnea T.O. Kondr. & S.Y. Kondr. 2015, in Kondratyuk et al., Acta Botanica Hungarica, 57(3-4), 291-320 (2015).
Etymology: The species epithet reflects the brown color of colony-like formations during cultivation.
Diagnosis: The brown yeast-like fungus showing very slow growth on any nutrient media, while the best growth observed on Saburo agar medium and potato sections; cells single, very small to 1.5–2 μm diam., mainly regularly rounded or spherical, with 1–2 or several smaller budding cells or cells groups; cells do not form chains; matrix not observed, forming only more or less dense brown or dark-brown colony-like formations; true mycelium is absent; L-rhamnose, L-malate and xylitol assimilation registered; nitrification activity absent and sorbose assimilation weakly observed.
Index Fungorum Number: IF813889
Figure 1. Phylogeny of the yeast-like fungi based on ITS nrDNA sequences. Thick branches represent nodes supported by PP ≥ 99% and ML bootstrap ≥ 95%. 1 = Meripilaceae of the Polyporales, 2 = Meruliaceae of the Polyporales, 3 = Tremellomycetes, 4 = Pezizomycotina.
Figure 2. Pseudonadsoniella brunnea (holotype), general habit.
Figure 3. Pseudonadsoniella brunnea (holotype), general habit.
Figure 4. Pseudonadsoniella brunnea (holotype). – Pseudomycelium and multiple budding parent cells (on Potato dextrose agar medium).
Figure 5. Pseudonadsoniella brunnea (holotype). – Large dark brown cells and small light brown cells (on Potato dextrose agar medium).
Reference:
Kondratyuk, T. O., Kondratyuk, S. Y., Morgaienko, O. O., Khimich, M. V., Beregova, T. V., & Ostapchenko, L. I. (2015). Pseudonadsoniella brunnea (Meripilaceae, Agaricomycotina), a new brown yeast-like fungus producing melanin from the Antarctic; with notes on nomenclature and type confusion of Nadsoniella nigra. Acta Botanica Hungarica, 57(3-4), 291-320.
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