Linnemannia yunnanensis X. Y. Ji, H. Zhao & X. Y. Liu, 2025

Ji, Xin-Yu, Ding, Zi-Ying, Liu, Wen-Xiu, Li, Fei, Zhao, Heng, Wang, Shi & Liu, Xiao-Yong, 2025, Unveiling species diversity within Mortierellomycota from China X: Three new species in Linnemannia and one in Mortierella, MycoKeys 125, pp. 245-262 : 245-262

Linnemannia yunnanensis X. Y. Ji, H. Zhao & X. Y. Liu sp. nov.

Fig. 5

Type.

China • Yunnan Province, Yuxi City, Xinping Dai Autonomous County, Ancient Tea Horse Road ( 23°57'28"N, 101°30'38"E, altitude 2196.56 m), from soil, 16 May 2024, X. Y. Ji, holotype HMAS 354071 , ex-holotype living culture CGMCC 3.28890 (= XG 08668-7-1 ) .

Etymology.

The epithet “ yunnanensis ” (Lat.) refers to the type location, Yunnan province.

Description.

Colonies on PDA at 16 ° C for 5 d, reaching 57 mm diameter, moderately fast growing with a rate of 11.4 mm / d, garlic smell, with sparse aerial mycelia, rose patterned. Hyphae hyaline, 2.5–7.4 µm in diameter (n = 15, x ̄ = 5.2), sometimes swollen. Sporangia deliquescent-walled. Sporangiospores smooth, hyaline, mostly round, 5.0–9.8 µm in diameter (n = 20, x ̄ = 7.3 µm). Chlamydospores present, mostly oval, 13.3–18.1 × 7.3–15.0 µm (n = 15, x ̄ = 16.5 × 9.8 µm). Zygospores not found.

Temperature requirements.

Minimum growth temperature 4 ° C and maximum growth temperature 29 ° C.

Additional strains examined.

China • Yunnan Province, Yuxi City , Xinping Dai Autonomous County ( 23°56'39"N, 101°30'1"E, altitude 2397.53 m), from soil, 16 May 2024, X. Y. Ji, living culture XG 08668-7-2 .

Notes.

Phylogenetic analysis of the five combined genes of ITS, LSU, SSU, RPB 1, and Act showed that the new species Linnemannia yunnanensis is closely related to L. bainierella (Fig. 1 ). The new species is distinguished from L. bainierella by 141 / 640 and 137 / 1007 characters in ITS and LSU sequences, respectively. Morphologically, compared to L. bainierella , the new species has larger sporangiospores (5.0–9.8 µm vs 5.0–7.0 × 2.5–4.0 µm).

Figures

Figure 1. The Maximum Likelihood phylogenetic tree for the genus Linnemannia based on combined ITS, LSU, SSU, RPB 1, and Act sequences with Mortierella longicollis as outgroup. Node supports are indicated by two metrics: Maximum Likelihood Bootstrap Values (left, MLBV ≥ 70 %) and Bayesian Inference Posterior Probabilities (right, BIPP ≥ 0.90), separated by a slash (/). Novel species are emphasized in red. Bold entries with asterisks (*) denote ex-type or ex-holotype strains. The scale bar in the lower left represents 0.1 substitutions per site.

Figure 5. Linnemannia yunnanensis ex-holotype CGMCC 3.28890. a, b. Colonies on PDA (a. obverse; b. reverse); c – g. Chlamydospores; h, i. Typical swollen hyphae; j – m. Sporangiospores. Scale bars: 10 µm (c – m).