Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora basalicellularispora

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

Index Fungorum number: IF 557596; Facesoffungi number: FoF 07981

Holotype: MFLU 20–0288

Etymology: Referring to the conidia which have a basal cell.

 

Saprobic on submerged decaying wood. Sexual morph: Undetermined. Asexual morph: Colonies effuse on natural substrate, hairy, dark brown. Mycelium mostly immersed, composed of grayish brown, septate, branched, smooth hyphae. Conidiophores 260–395 × 8–12 μm (x̄ = 327 × 10 μm, n = 20) wide, mononematous, macronematous, solitary, cylindrical, erect, straight or slightly flexuous, mostly unbranched, septate, brown to dark brown, slightly paler toward apex, smooth. Conidiogenous cells holoblastic, monoblastic, integrated, initially terminal, later becoming intercalary, cylindrical, smooth, pale brown, proliferating percurrently. Conidia 27.5–33.7 × 21.7–25.8 μm (x̄ = 30.6 × 23.7 μm, n = 30) wide, acropleurogenous, solitary, dry, broadly obovoid to spherical, smooth, pale orange-brown to olivaceous brown, aseptate, with several small or large guttules, with a small, hyaline, subcylindrical to subglobose basal cell, germinating from basal cell. (Descriptions from Bao et al. 2020)

 

Material examined: CHINA, Yunnan Province, Gaoligongshan Mountain, on decaying wood submerged in a stream, August 2015, A.L. Shi, S-431 (MFLU 20–0288, holotype); ex-type culture, MFLUCC 16–0992.

 

Notes: In the phylogenetic analysis, Acrogenospora basalicellularispora clustered with A. sphaerocephala (CBS 206.36) with low support (66% ML and 0.98 BYPP) (Bao et al. 2020). Unfortunately, CBS 206.36 lacks a morphological description and only LSU sequence data is available in GenBank. Morphologically, the new isolate can be distinguished from other Acrogenospora species by its pale orange-brown to olivaceous brown, broadly obovoid to spherical conidia with several small to large guttules and a small, hyaline, subcylindrical to subglobose basal cell. In the study of Bao et al. (2020), A. aquatica also has conidia with a basal cell. However, it can be distinguished by the shape (broadly obovoid to spherical vs. subprolate to broadly ellipsoidal) and color (pale orange-brown to olivaceous brown vs dark brown to black) of conidia and size (260–395 × 8–12 vs. 200–250 × 7.5–9.5 μm) of conidiophores. (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 basalicellularispora (MFLU 20–0288, holotype). a. Colony on wood. b. Conidiophores, conidiogenous cells and conidia. c. Conidiogenous cells and conidia. d–h. conidia. i. Germinating conidium. j,k. Culture on MEA (upper and lower view). Scale bars: a = 200 μm, b = 50 μm, c–I = 20 μm. (Bao et al. 2020)

 

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