Tubeufiales » Tubeufiaceae » Dictyospora

Dictyospora thailandica

Dictyospora thailandica Brahamanage, Y.Z. Lu, Boonmee & K.D. Hyde

Index Fungorum number: IF 553179; Facesoffungi number: FoF 03263

Etymology: Name referring to the host locality country Thailand.

Holotype: MFLU 17-0500

 

Saprobic on submerged decaying wood. Sexual morph: Ascomata 173–212 μm × 165–206 μm diam. (x̄ = 195 × 188 μm, n = 5), superficial, seated on a subiculum, solitary, scattered, globose to subglobose, dark brown to black, surrounded by brown to black setae, with 53–95 (–103) × 3–5 μm septate, tapering towards an acute end at apex. Peridium 21–38 μm wide, composed of several layers of hyaline to brown-cells of textura angularis, with outer layer darkened cells and inner layer pale brown to hyaline cells. Hamathecium comprising numerous filiform, septate, hyaline pseudoparaphyses. Asci 129–182 × 18–24.5 μm (x̄ = 152 × 21 μm, n = 20), 8-spored, bitunicate, cylindrical, apically rounded, shortpedicellate or sessile. Ascospores 76–107 × 4.5–7 μm (x̄ = 95 × 5.5 μm, n = 50), fasciculate, broadly fusiform, cylindrical to long. sub fusiform, elongate, slightly curved, tapering towards rounded ends, phragmoseptate, hyaline, guttulate, smooth-walled. Asexual morph: hyphomycetous, dictyosporous. Conidia 51–100 × 39–62 μm (x̄ = 72.5 × 51 μm, n = 20), blastic, broadly oval to ellipsoid, dictyoseptate, pale brown when immature, becoming dark to black when mature. (Brahamanage et al. 2017)

 

Culture characteristics: Ascospores germinating on WA within 12 h. Colonies growing on malt extract agar (MEA), reaching 18 mm in 2 weeks at 28°C, effuse, dentate and lobate edges, darkly brown. Mycelium superficial and partly immersed, branched, septate, pale brown to brown, smooth-walled, due to the development of muriform chlamydospores

 

Material examined: THAILAND, Uttaradit, Laplae, Mae Phun, Ban Ton Klua, on submerged decaying wood, 24 October 2015, S. Boonmee, UTD01 (MFLU 17-0500, holotype), isotype in BBH, ex-type living culture, MFLUCC 16−0001 and UTD 22 (MFLU 17-0703, paratype), ex-type living culture, MFLUCC 16−0215, TBRC.

 

Freshwater distribution: Thailand (Brahmanage et al. 2017; Lu et al. 2018)

 

Fig 1. Dictyospora thailandica (MFLU 17-0500, holotype). a Appearance of ascomata on wood substrate. b Vertical section through ascoma. c Peridium. d Close up of ostiole. e Setae. f–h Asci. i–l Ascospores. Scale bars – a = 200 μm, b, f–h = 100 μm, c–e, i–l = 50 μm. (Brahamanage et al. 2017)

 

Fig 2. Dictyospora thailandica on MEA after 8 weeks (MFLUCC 16-0001, holotype). a Germinating ascospore. b, c Culture on PDA. d Conidia on colony. e Conidiophores with conidia. f–i Mature and immature conidia. Scale bars – a, f–i = 50 μm, b–c = 20 mm, d = 200 μm, e = 100 μm. (Brahamanage et al. 2017)

 

References

Lu YZ, Liu JK (Jack), Hyde KD, Jeewon R, Kang JC, Fan C, Boonmee S, Bhat DJ, Luo ZL, Lin CG, Eungwanichayapant PD (2018) A taxonomic reassessment of Tubeufiales based on multi-locus phylogeny and morphology. Fungal Divers 92:131–344. https://doi.org/10.1007/s13225-018-0411-y

Brahmanage RS, Lu YZ, Bhat DJ, Wanasinghe DN, Yan JY, Hyde KD, Boonmee S (2017) Phylogenetic investigations on freshwater fungi in Tubeufiaceae (Tubeufiales) reveals the new genus Dictyospora and new species Chlamydotubeufia aquatica and Helicosporium flavum. Mycosphere 8:917–933. https://doi.org/10.5943/MYCOSPHERE/8/7/8

 

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