Tubeufiales » Tubeufiaceae » Berkleasmium

Berkleasmium guangxiense

Berkleasmium guangxiense (Y.Z. Lu, Boonmee & K.D. Hyde) Y.Z. Lu

Basionym: Neoacanthostigma guangxiense Y.Z. Lu, Boonmee & K.D. Hyde, Cryptog. Mycol. 38(2): 182 (2017)

Index Fungorum number: IF 553172; Facesoffungi number: FoF 03241

Etymology: ‘guangxi’ referring to collecting site.

Holotype: HKAS 97425

 

Saprobic on decaying wood in a freshwater stream. Colonies effuse, Alice blue. Mycelium mostly immersed, partly superficial. Hyphae branched, septate, subhyaline to pale brown. Sexual morph: Undetermined. Asexual morph: hyphomycetous, helicosporous. Conidiophores 19–37 × 3.5–5 μm, pale brown, macronematous, erect, short, cylindrical, septate, smooth-walled. Conidiogenous cells 8.5–21.5 μm long, 3.5–5 μm wide, holoblastic, polyblastic, sympodial, integrated, terminal, cylindrical, with a truncate apex, hyaline to pale brown, smooth-walled. Conidia 90–130(–144) μm diam. and conidial filament 8–10 μm wide (x̄ = 115 × 9 μm, n=50), 405–725(–800) μm long, coiled 2½–3½ times when tightly coiled, becoming loosely coiled in the water, basal cell elongated, rounded at tip, multiseptate, up to 62-septate, not constricted at septa, grey to pale blue, smooth-walled. (Descriptions from Lu et al. 2017)

 

Material examined: CHINA, Guangxi Province, Fang Cheng Gang, on decaying wood in a freshwater stream, 15 May 2016, Yong-Zhong Lu, JHC07-1 (HKAS 97425, holotype; GZAAS 16-0048, isotype); ex-type living culture, MFLUCC 17-0042 = GZCC 16-0036

 

Notes: Berkleasmium guangxiense formed an asexual morph on the natural substrate and is morphologically similar to B. aquaticum. It resembles B. aquaticum in having macronematous, erect, short conidiophores and terminal to sympodial conidiogenous cells and helicoid conidia, but it differs from B. aquaticum in different number of septate (up to 62-septate vs up to 93-septate). Besides, its colony on PDA medium are surface flat and without wrinkled, but the colony of B. aquaticum on PDA medium are umbonate, surface roughed and wrinkled. (Notes from Lu et al. 2017)

 

Freshwater distribution: China (Lu et al. 2017)

 

Fig 1. Berkleasmium guangxiense (HKAS 97425, holotype). a Colony on decaying wood. b, d Conidiophores with attached conidia. c Conidiophores. e-g Holo- to sympodial conidiogenous cells with part of conidia. h-k Conidia. l-m Colony on PDA from above and below. Scale bars: b = 100 µm, c, e-g = 20 µm, d, h-k = 50 µm, l-m = 20 mm. (Lu et al. 2017)

 

References

Lu YZ, Boonmee S, Liu JK, Hyde KD, Bhat DJ, Eungwanichayapant PD, Kang JC (2017) Novel Neoacanthostigma species from aquatic habitats. Cryptogam Mycol 38:169–191

 

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