Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora submersa

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

Index Fungorum number: IF 557601; Facesoffungi number: FoF 07986

Holotype: MFLU 20–0294

Etymology: Referring to the submerged habitat 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 163–223 × 6.5–10 μm (x̄ = 193 × 8.4 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 28–32.5 × 25–28 μm (x̄ = 30.3 × 26.5 μm, n = 30), acropleurogenous, solitary, spherical or subspherical, base truncate, aseptate, hyaline when young, pale orange-brown to olivaceous brown when mature, smooth. (Descriptions from Bao et al. 2020)

 

Material examined: CHINA, Yunnan Province, saprobic on decaying wood submerged in Lancang River, 9 December 2017, Z.L. Luo, S-1601 (MFLU 20–0294, holotype), ex-type culture, MFLUCC 18–1324.

 

Notes: Acrogenospora submersa is similar to A. hainanensis in having mononematous, macronematous, solitary, proliferating percurrently conidiophores, monoblastic, integrated, terminal conidiogenous cells and spherical or subspherical, aseptate conidia. However, A. submersa differs from A. hainanensis by having longer conidiophores (163–223 × 6.7–10 μm vs. 60–80 × 2–3.5 μm), and much larger conidia (28–32.5 × 25–28 μm vs. 7.5–9.5 × 7–8.5 μm), which are hyaline to pale orange-brown or olivaceous brown rather than brown. Phylogenetically, A. submersa is related to A. guttulatispora but in a distinct lineage. (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 submersa (MFLU 20–0294, holotype). a. Colonies on wood. b–g. Conidiophores with conidia. h,i. Conidiogenous cells with conidia. j,k. conidia. i. Germinating conidium. m,n. Culture on MEA (upper and lower view). Scale bars: a = 200 μm, b–g = 50 μm, h–l = 20 μm.

 

Recent Genus

1
Neochlamydotubeufia
Neohelicomyces

Recent Species

Neohelicomyces submersus
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