Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora guttulatispora

Acrogenospora guttulatispora D.F. Bao, Z.L. Luo, K.D. Hyde & H.Y. Su

Index Fungorum number: IF 557597; Facesoffungi number: FoF 07982

Holotype: MFLU 20–0289

Etymology: Referring to the large guttule in the conidia.

 

Saprobic on submerged decaying wood. Sexual morph: Undetermined. Asexual morph: Colonies effuse on natural substrate, hairy, dark brown. Mycelium mostly immersed, composed of septate, grayish brown, branched, smooth hyphae. Conidiophores 295–330 × 7.5–8.5 μm (x̄ = 312.7 × 8 μm, n = 15), mononematous, macronematous, solitary, erect, straight or slightly flexuous, cylindrical, indeterminate, unbranched, dark brown, paler toward apex, pale brown to hyaline at apex, septate, guttulate, smooth. Conidiogenous cells holoblastic, monoblastic, integrated, initially terminal, later becoming intercalary, cylindrical, smooth, pale brown, proliferating percurrently. Conidia 30–33.5 × 26.5–28 μm (x̄ = 34 × 27 μm, n = 30), acropleurogenous, solitary, spherical or subspherical, truncate at base, hyaline when young, dark brown when mature, aseptate, with a large guttule, smooth. (Descriptions from Bao et al. 2020)

 

Material examined: CHINA, Yunnan Province, Dali, Cangshan Mountain, on decaying wood submerged in Heilongxi stream, June 2013, Z.L. Luo. S-189 (MFLU 20–0289, holotype), ex-type culture, MFLUCC 17–1674 = ICMP 21772.

 

Notes: Acrogenospora guttulatispora can be distinguished from other species by the large guttule in the conidia. In the phylogenetic analyses, A. guttulatispora is close to A. aquatica. However, the conidia of A. guttulatispora are spherical or subspherical with a large guttule, without a basal cell. While those of A. aquatica are subprolate to broadly ellipsoidal with a hyaline, globose to subglobose basal cell. In addition, there are 22 base pair differences in the RPB2 region between these two species. (Notes from Bao et al. 2020)

 

References

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 guttulatispora (MFLU 20–0289, holotype). a–c. Colonies on wood. d–f. Conidiogenous cells and conidia. g–i. Conidiophores. j–n. conidia. o. Germinating conidium. Scale bars: a–c = 200 μm, d–f = 30 μm, g = 100 μm, h,i = 50 μm, j–o = 10 μm. (Bao et al. 2020)

 

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