Pleosporales » Pseudoastrosphaeriellaceae » Pseudoastrosphaeriella

Pseudoastrosphaeriella aquatica

Pseudoastrosphaeriella aquatica W. Dong, H. Zhang & K.D. Hyde

Index Fungorum number: IF557932, Facesoffungi number: FoF09275

Holotype: MFLU 18-0996

Etymology: referring to aquatic habitat of this fungus

 

Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascostromata 250–350 μm high, 280–320 μm diam., black, scattered or gregarious, immersed with neck erumpent through host tissue, becoming raised, subglobose, coriaceous, ostiolate. Neck 450–500 μm high, 100–110 μm diam., black, central, cylindrical, oblique, brittle, thickwalled, comprising some layers of blackened cells, carbonaceous. Peridium 15–25 μm thick, of unequal thickness, composed of thin-walled, hyaline to brown, compressed cells of textura angularis or textura prismatica, outer layers comprising host cells and fungal tissue. Pseudoparaphyses 1 μm diam., numerous, trabeculate, filiform, hyaline, branching and anastomosing, embedded in a gelatinous matrix. Asci 145–260 × 19–25 μm (x̄ = 213 × 22 μm, n = 15), 8-spored, bitunicate, distinctly clavate, or cylindrical, with elongate pedicel, up to 115 μm long, with indistinct ocular chamber. Ascospores 40–48 × 8–10.5 μm (x̄ = 44.5 × 9.5 μm, n = 30), overlapping uni-seriate or uni-seriate at the base and bi- to tri-seriate near the apex, fusiform, with acute or rounded ends, brown, 3-septate, constricted at the septa, swollen above central septum, guttulate, thin-walled, smooth. Asexual morph: Undetermined. (Description from Dong et al. 2020)

 

Material examined: THAILAND, Chiang Mai Province, on submerged wood in a stream, 9 February 2018, X.D. Yu, Y18 (MFLU 18-0996, holotype), ex-type living culture MFLUCC 18-0984; Phayao Province, on submerged wood, 23 February 2018, X.D. Yu, Y27 (MFLU 18-1005), living culture MFLUCC 18-0991; Chiang Rai Province, on submerged wood, 10 April 2018, X.D. Yu, Y41 (MFLU 18-1016), living culture KUMCC 19-0096.

 

Notes: Pseudoastrosphaeriella aquatica is similar to P. papillata in having black ascomata with long necks and similar in shape and overlapping size of ascospores, but the smooth-walled, 3-septate ascospores of the former differs from the rough-walled, mostly 1-septate ascospores with small, pad-like appendages of the latter (Hyde and Frohlich 1998; Phookamsak et al. 2015). (Notes from Dong et al. 2020)

 

Freshwater distribution: Thailand (Dong et al. 2020)

 

Fig. 1 Pseudoastrosphaeriella aquatica (MFLU 18-0996, holotype). a, b Ascomata immersed with neck erumpent through host substrate. c, d Vertical section of ascomata. e Structure of peridium. f, g Asci embedded in numerous of pseudoparaphyses. h, i Bitunicate asci. j–l Ascospores. m Germinated ascospores. n, o Colony on PDA (up-front, down-reverse). Scale bars: c, d = 100 μm, e = 10 μm, f, g = 30 μm, h, i, m = 50 μm, j–l = 20 μm. (Dong et al. 2020)

 

References

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Hyde KD, Fröhlich J (1998) Fungi from palms XXXVII. The genus Astrosphaeriella, including ten new species. Sydowia 50(1):81–132

Phookamsak R, Norphanphoun C, Tanaka K, Dai DQ, Luo ZL, Liu JK, Su HY, Bhat DJ, Bahkali AH, Mortimer PE (2015) Towards a natural classification of Astrosphaeriella-like species; introducing Astrosphaeriellaceae and Pseudoastrosphaeriellaceae fam. nov. and Astrosphaeriellopsis, gen. nov. Fungal Divers 74:143–197

 

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