Yamadazyma ovata C.Y. Chai & F.L. Hui, 2021

Gao, Wan-Li, Li, Ying, Chai, Chun-Yue, Yan, Zhen-Li & Hui, Feng-Li, 2021, New species of Yamadazyma from rotting wood in China, MycoKeys 83, pp. 69-84 : 69

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Yamadazyma ovata C.Y. Chai & F.L. Hui

sp. nov.

Yamadazyma ovata C.Y. Chai & F.L. Hui sp. nov.

Figure 3 View Figure 3


China, Henan Province, Luoyang City , Song County, in rotting wood from a forest park, September 2019, J.Z. Li & Z.T Zhang (holotype NYNU 191125T, culture ex-type CBS 16655 View Materials , CICC 33500) .


The species name Yamadazyma ovata refers to the ovoid cell morphology of the type strain.


The cells are ovoid to ellipsoid (2-3 × 3-6.5 μm) and occur singly or in pairs after growth in a YM broth for three days at 25 °C (Figure 3A View Figure 3 ). Budding is multilateral. After three days of growth on YM agar at 25 °C, the colonies are white to cream-colored, buttery, and smooth with entire margins. After nine days at 25 °C, on a Dalmau plate culture with CM agar, pseudohyphae consisting of elongated cells with lateral buds are formed (Figure 3B View Figure 3 ). True hyphae are not observed. Asci or signs of conjugation are not observed on sporulation media. Glucose, galactose, and trehalose are fermented, but maltose, sucrose, melibiose, lactose, cellobiose, melezitose, raffinose, d-xylose, and inulin are not. Glucose, galactose, l-sorbose, d-glucosamine, d-ribose, d-xylose, l-arabinose, d-arabinose, sucrose, maltose, trehalose, methyl α-d-glucoside, cellobiose, salicin, melibiose, melezitose, glycerol, erythritol, ribitol, xylitol, d-glucitol, d-mannitol, d- galactitol, d-glucono-1, 5-lactone, 2-keto-d-gluconate, d-gluconate, succinate, citrate, and ethanol are assimilated. No growth is observed in l-rhamnose, lactose, raffinose, inulin, myo -inositol, d-glucuronate, dl-lactate, or methanol. In nitrogen-assimilation tests, growth is present on l-lysine, creatine, glucosamine, and d-tryptophan, while growth is absent on nitrate, nitrite, ethylamine, cadaverine, creatinine, or imidazole. Growth is observed at 37 °C, but not at 40 °C. Growth in the presence of 16% NaCl with 5% glucose is present, but growth in the presence of 0.01% cycloheximide and 1% acetic acid is absent. Starch-like compounds are not produced. Urease activity and diazonium blue B reactions are negative.

Additional isolates examined.

China, Henan Province, Luoyang City, Song County, in rotting wood from a forest park, September 2019, J.Z. Li & Z.T Zhang, NYNU 19116, NYNU 19130.

GenBank accession numbers.

Holotype NYNU 191125T (ITS: MT990560; D1/D2 LSU: MT990559); additional isolates NYNU 19116 (ITS: MZ318442; D1/D2 LSU: MZ318423), and NYNU 19130 (ITS: MZ318424; D1/D2 LSU: MZ318425).


We generated sequences for three isolates of Y. ovata , NYNU 191125, NYNU 19116, and NYNU 19130. This new species is phylogenetically most closely related to C. trypodendroni (Figure 1 View Figure 1 ). Yamadazyma ovata can be distinguished from C. trypodendroni based on ITS and D1/D2 LSU loci (15/565 in ITS and 8/532 in D1/D2 LSU). Physiologically, Y. ovata can be differentiated from C. trypodendroni based on growth in l-sorbose, d-glucosamine, melibiose, and d-glucono-1, 5-lactone, all of which are positive for Y. ovata and negative for C. trypodendroni (Table 2 View Table 2 ) ( Lachance et al. 2011).