Minutisphaerales » Acrogenosporaceae » Acrogenospora

Acrogenospora thailandica

Acrogenospora thailandica J. Yang & K.D. Hyde, in Hyde et al., Fungal Diversity: 10.1007/s13225-019-00429-2, [78] (2019)

Index Fungorum number: IF555499         Facesoffungi number: FoF04676



Sexual morph: Undetermined. Asexual morph: Colonies sparse, scattered, dark brown, glistening, hairy. Mycelium mostly immersed, consisting of septate, hyaline to pale brown hyphae. Conidiophores 850–950 × 3.5–8 μm, macronematous, mononematous, solitary, erect, straight or slightly flexuous, septate, long cylindrical, slightly tapering towards the apex, pale to dark brown, paler towards the apex, smooth, thickwalled at the base. Conidiogenous cells monoblastic, integrated, intercalary, brown, cylindrical. Conidia acrogenous, 15.5–24.5 μm (x̄ = 19 μm, n = 35) diam., holoblastic, olive-green to dark brown, spherical or subspherical, unicellular, smooth and thick-walled, guttulate, truncate at the base.


Culture characteristics: Conidia germinating on PDA within 24 h. Germ tubes produced from both ends. Colonies on PDA slow growing, reaching 7–10 mm diameter after two weeks at 25 °C in natural light, circular, with dark grayish green aerial mycelium on the surface, black in reverse with entire margin.


Material examined: Thailand, Trat Province, Amphoe Ko Chang, 12°080N, 102°380E, on decaying wood submerged in a freshwater stream, 27 April 2017, Yong-Zhong Lu, YJT-30-2 (MFLU 18-1129, holotype; HKAS102140, isotype), ex-type living culture (MFLUCC17-2396).


GenBank Accession No: ITS: MH606234, LSU: MH606223, RPB2: MH626449, SSU: MH606221


Notes: Phylogenetic analyses indicate that Acrogenospora thailandica forms a basal branch in the genus together with its sister taxon Acrogenospora sp. (JX-43) with strong support. Yang et al. (2016c) reported Acrogenospora sp. (JX-43) with LSU, SSU and ITS sequence data and only mentioned that Acrogenospora sp. (JX-43) is morphologically similar to A. sphaerocephala. We therefore identify Acrogenospora sp. (JX-43) as A. thailandica based on the phylogenetic result. Acrogenospora thailandica resembles A. sphaerocephala in having relatively long conidiophores, monoblastic, intercalary conidiogenous cells and globose conidia of similar size, but A. thailandica has much longer conidiophores (850–950 μm long) than those of A. sphaerocephala (155–360 μm long).


Figure X. Acrogenospora thailandica (MFLU 18-1129, holotype). a Colony on substrate. b, c Conidiophores with conidia. d, e Conidiogenous cells with conidia. f, g Conidia. h Germinated conidium on PDA. i Reproduced conidiophores and conidia from culture. j, k Culture (j from above view, k from below view). Scale bars: a = 500 μm, b, c = 200 μm, i = 100 μm, d = 30 μm, e–h = 20 μm.



Reference: Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ, et al. (2019) Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity 96(1): 1242.


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