Geotrichum hubeiense L. C. Guo, H. Y. Zhu, P. J. Han & F. Y. Bai, 2025

Geotrichum hubeiense L. C. Guo, H. Y. Zhu, P. J. Han & F. Y. Bai sp. nov.

Fig. 2 View Figure 2

Etymology.

The species is named after the location “ Hubei Province, China, ” where the type strain of the species was collected.

Holotype.

China • Hubei Province, Enshi City , Xianfeng County, from a bark sample, on July 7, 2023, L. C. Guo, (holotype CGMCC 2.7499 View Materials T, permanently preserved in a metabolically inactive state, ex-holotype JCM 36896 View Materials = 2-17-ESXF-26-1 ).

Description.

Culture characteristics: After 10 days on YPD agar at 30 ° C, colonies are 22 mm in diameter, flesh colour, flat, dry, with finely hairy and regular margins (Fig. 2 A View Figure 2 ). Hyphae soon disarticulate into cubic arthroconidia measuring 2.1–5.2 × 3.8–9.8 μm (Fig. 2 B-C View Figure 2 ). Hyphae and arthroconidia produce oblong blastoconidia measuring 2.9–6.8 × 5.2–17.2 μm, which were observed on PDA and YCB agar after one month at 25 ° C (Fig. 2 D View Figure 2 ). Sexual structures were not observed on YCB, PDA, V 8, YM, and CMA agar. Physiological and biochemical characteristics: Glucose is not fermented. Glucose, D-galactose, L-sorbose, D-xylose, ethanol, glycerol, D-mannitol, D-glucitol, DL-lactic acid, succinic acid (weak), and citric acid (weak) are assimilated as sole carbon sources. Trehalose, ribitol, sucrose, D-maltose, cellobiose (slow), lactose, melibiose, raffinose, melezitose, inulin, starch soluble, L-arabinose, D-arabinose, D-ribose, L-rhamnose, D-glucosamine, methanol, erythritol, galactitol, α-methyl-D-glucoside, salicin, D-glucuronic acid, inositol, hexadecane, N-acetyl-D-glucosamine, and xylitol are not assimilated as sole carbon sources. Ethylamine, cadaverine, ammonium sulfate, L-lysine, potassium nitrate (late), and sodium nitrite (weak) are assimilated as sole nitrogen sources. Urease activity is negative. Diazonium Blue B reaction is negative. Extracellular starch compounds are not produced. No growth occurs in 10 % (w / v) sodium chloride plus 5 % (w / v) glucose medium. Growth occurs on 60 % (w / v) glucose-yeast extract agar. Growth in vitamin-free medium is positive. Growth occurs on YPD agar at 35 ° C, but not at 37 ° C.

Materials examined.

China • Hubei Province, Enshi City , Xianfeng County, from a bark sample, in July 2023, L. C. Guo, living culture 2-25-ESXF-26-2 = CGMCC 2.7418 View Materials = JCM 36897 View Materials .

Notes.

Physiologically, G. hubeiense sp. nov. differs from its closely related species, G. carabidarum and G. histeridarum , in its ability to assimilate D-galactose and grow on 60 % (w / v) glucose-yeast extract agar.