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

Fig. 3

Type.

China • Xizang, Nyingchi City, Bayi District ( 29°33'40"N, 94°33'13"E, altitude 3713 m), from soil, 29 August 2024, X. Y. Ji, holotype HMAS 354073 , ex-holotype living culture CGMCC 3.28892 (= XG 10460-10-1 ) .

Etymology.

The epithet chlamydospora (Lat.) refers to a larger number of chlamydospores.

Description.

Colonies on PDA at 16 ° C for 5 d, reaching 70 mm diameter, fast growing with a rate of 14 mm / d, garlic smell, annual ring-like. Hyphae hyaline, 2.0–7.8 µm wide (n = 15, x ̄ = 4.8). Sporangia mostly spherical, smooth, hyaline, 9.0–12.7 µm in diameter (n = 15, x ̄ = 11.2). Sporangiospores hyaline, smooth, mostly round, 5.8–12.7 µm in diameter (n = 15, x ̄ = 9.6). Chlamydospores abundant, oval, round, and irregular, 11.2–33.6 µm long and 6.8–21.7 µm wide (n = 15, x ̄ = 17.4 × 13.0 µm). Zygospores not found.

Temperature requirements.

Minimum growth temperature 4 ° C and maximum growth temperature 28 ° C.

Additional strains examined.

China • Xizang, Nyingchi City, Bayi District ( 29°33'40"N, 94°33'13"E, altitude 3713 m), from soil, 29 August 2024, X. Y. Ji, living culture XG 10460-10-2 .

Notes.

The phylogenetic analysis showed that the new species L. chlamydospora is closely related to L. longigemmata (Fig. 2 ). It is distinguished from L. longigemmata by 55 / 621 characters in ITS sequences. Morphologically, compared to L. longigemmata , the new species has larger sporangiospores (5.8–12.7 µm vs 5.0–9.0 µm) and smaller chlamydospores (11.2–33.6 × 6.8–21.7 µm vs up to 60.0 µm).

Figures

Figure 2. The Maximum Likelihood phylogenetic tree for the genus Mortierella based on combined ITS, LSU, SSU, RPB 1, and Act sequences with Umbelopsis autotrophica as an 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 3. Linnemannia chlamydospora ex-holotype CGMCC 3.28892. a, b. Colonies on PDA (a. obverse; b. reverse); c, d. Sporangia; e – i. Chlamydospores; j – m. Sporangiospores. Scale bars: 10 µm (c – m).