Acrogenospora yunnanensis D.F. Bao, Z.L. Luo, K.D. Hyde & H.Y. Su
Index Fungorum number: IF 557600; Facesoffungi number: FoF 07985
Holotype: MFLU 20–0292
Etymology: Referring to Yunnan province, China, where the fungus was collected.
Saprobic on submerged decaying wood. Sexual morph: Undetermined. Asexual morph: Colonies effuse on natural substrate, hairy, dark brown. Mycelium partly immersed, partly superficial, composed of septate, brown to dark brown, branched, smooth hyphae. Conidiophores 260–390 × 8.5–12 μm (x̄ = 326 × 10.3 μm, n = 15), mononematous, macronematous, solitary, erect, straight or slightly flexuous, cylindrical, unbranched, brown to dark brown, paler toward apex, septate, smooth. Conidiogenous cells holoblastic, monoblastic, integrated, initially terminal, later becoming intercalary, cylindrical, smooth, pale brown, proliferating percurrently. Conidia 23–32.5 × 22–30 μm (x̄ = 28 × 26 μm, n = 30), acropleurogenous, solitary, spherical or subspherical, truncate at base, aseptate, hyaline when young, dark brown to black when mature, smooth. (Descriptions from Bao et al. 2020)
Material examined: CHINA, Yunnan Province, Laojunshan Mountain, on decaying wood submerged in a stream, August 2015, A.L. Shi, S-1114 (MFLU 20–0292, holotype); ex-type culture, MFLUCC 18–1611. CHINA, Gaoligingshan mountain, saprobic on decaying wood submerged in a stream, August 2015, A.L. Shi. S-774 (DLU 774, isotype), living culture, MFLUCC 20–0099.
Notes: In the phylogenetic analysis, Acrogenospora yunnanensis shares a sister relationship to A. submersa (Bao et al. 2020). Morphologically, A. yunnanensis can be distinguished from A. submersa by the longer conidiophores and color of conidia. Acrogenospora yunnanensis has dark brown to black conidia with a large guttule, while conidia of A. submersa are pale orange-brown to olivaceous brown at maturity and lack a guttule. Morphologically, A. yunnanensis is most similar to A. gigantospora and A. subprolata in having similar conidial shape. However, they differ in size of conidiophores and conidia. (Notes from Bao et al. 2020)
Bao DF, McKenzie EHC, Bhat DJ, et al (2020) Acrogenospora (Acrogenosporaceae, Minutisphaerales) appears to be a very diverse genus. Front Microbiol 1606. https://doi.org/10.3389/fmicb.2020.01606
Fig 1. Acrogenospora yunnanensis (MFLU 20–0292, holotype). a. Colony on wood. b–d. Conidiophores, conidiogenous cells and conidia. e–g. Conidiogenous cells and conidia. h–k. Conidia. Scale bars: a = 200 μm, b–d = 50 μm, e–g = 30 μm, h–j = 15 μm.