Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora aquatica

Acrogenospora aquatica D.F. Bao, Z.L. Luo, K.D. Hyde & H.Y. Su
Index Fungorum number: IF 557599; Facesoffungi number: FoF 07984

Holotype: MFLU 20–0291

Etymology: “Aquatica” in connection with the aquatic habitat from which it was recovered.

 

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 200–250 × 7.5–9.5 μm (x̄ = 226 × 8.6 μm, n = 15), mononematous, macronematous, solitary, erect, straight or slightly flexuous, cylindrical, indeterminate, 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 29–34.5 × 24–31 μm (x̄ = 31.8 × 27.7 μm, n = 30), acrogenous, solitary, subprolate to broadly ellipsoidal, base truncate, dark brown to black, aseptate, lacking guttules, with a hyaline, globose to subglobose basal cell, smooth. (Descriptions from Bao et al. 2020)

 

Material examined: CHINA, Yunnan Province, Dali, Cangshan Mountain, on decaying wood submerged in a stream, January 2016, Q.S. Zhou, S-763 (MFLU 20–0291, holotype), ex-type culture MFLUCC 20–0097. CHINA, Yunnan Province, Dali, Cangshan Mountain, on decaying wood submerged in Qingbixi Stream, March 2016, Z. L. Luo, S-282 (DLU 282, isotype), living culture MFLUCC 16-0949,

 

Notes: Bao et al. (2020) found two species, A. basalicellularispora and A. aquatica with a hyaline, globose to subglobose basal cell. Acrogenospora aquatica can be distinguished from A. basalicellularispora by the size of conidiophores (259–395 × 8–12 vs. 202–250 × 7.8–9.3 μm). In addition, conidia of A. basalicellularispora are pale orange-brown to olivaceous-brown, with several small to large guttules, while conidia of A. aquatica are dark brown to black and lack guttules. Acrogenospora aquatica is phylogenetically close to A. guttulatispora. Acrogenospora aquatica similar to A. guttulatispora in having mononematous, macronematous, unbranched conidiophores, holoblastic, monoblastic conidiogenous cells and acrogenous, dark brown to black conidia. However, A. aquatica differs from A. guttulatispora in having subprolate to broadly ellipsoidal conidia with a hyaline, globose to subglobose basal cell, lacking guttules, while conidia of A. guttulatispora are spherical or subspherical, with a large guttule, lacking basal cell. (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 aquatica (MFLU 20–0291, holotype). a,b. Colonies on wood. c–f. Conidiophores, conidiogenous cells and conidia. g–i. Conidiogenous cells and conidia. j–m. Conidia. n Germinating conidium. Scale bars: a,b = 200 μm, c–f = 100 μm, g–I = 30 μm, j–n = 20 μm. (Bao et al. 2020)

 

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