Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora obovoidspora

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

Index Fungorum number: IF 557602; Facesoffungi number: FoF 04691

Holotype: MFLU 20–0295

Etymology: Referring to the broadly obovoid conidia of this fungus.

 

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 209–277 × 7.5–10 μm (x̄ = 243 × 8.8 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 32.5–37.5 × 27–32 μm (x̄ = 35 × 29.6 μm, n = 30) wide, acrogenous, solitary, oval to broadly ellipsoidal, base truncate, aseptate, olivaceous brown to black, thick-walled, smooth. (Descriptions from Bao et al. 2020)

 

Material examined: CHINA, Yunnan Province, Dali, Huadianba Mountain, saprobic on decaying wood submerged in a stream, 9 December 2017, Z.L. Luo, S-1614 (MFLU 20–0295, holotype); ex-type culture, MFLUCC 18–1622.

 

Notes: Acrogenospora obovoidispora is similar to A. gigantospora in having mononematous, macronematous, conidiophores and solitary, aseptate conidia. However, Acrogenospora obovoidspora differs from A. gigantospora in having solitary conidiophores and oval to broadly ellipsoidal, olivaceous brown to black conidia, while conidiophores of A. gigantospora are single or in groups of 2–4, and conidia are broadly obovoid to subspherical, dark brown to black (Ma et al. 2012). (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

Ma J, Ma LG, Zhang YD, et al (2012) Acrogenospora hainanensis sp. nov. and new records of microfungi from Southern China. Mycotaxon 120:59–66. https://doi.org/10.5248/120.59

 

Fig 1. Acrogenospora obovoidispora (MFLU 20–0295, holotype). a. Colony on wood. b–e. Conidiophores with conidia. f–i. Conidiogenous cells with conidia. j–n. Conidia. Scale bars: a = 200 μm, b–e = 50 μm, f–h = 30 μm, i–n = 20 μm. (Bao et al. 2020)

 

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