Minutisphaerales » Minutisphaeraceae » Minutisphaera

Minutisphaera aquaticum

Minutisphaera aquaticum D.F. Bao, Z.L. Luo, K.D. Hyde & H.Y. Su

Index Fungorum number: IF557049; Facesoffungi number: FoF 07084

Etymology: Referring to the aquatic habitat from which the fungus was collected.

Holotype: MFLU 19–2846

 

Saprobic on decaying wood, submerged in freshwater habitats. Sexual morph: Ascomata 71– 90 × 85–98 μm (x̄ = 80.5 × 91 µm, n = 5) diam, superficial, scattered, globose, dark brown to black. Ostiole absent. Peridium 12–17 μm wide, comprises two layers, outer layers composed of dark brown cells of textura angularis, inner layer composed rectangular to subglobose hyaline cells. Hamathecium composed of 1.2–2.0 μm wide, cellular pseudoparaphyses, sparse in young ascomata, becoming abundant with age. Asci 52–64 × 21.5–27.5 µm (x̄ = 58 × 23 µm, n = 20), 8- spored, bitunicate, fissitunicate, obovoid to broadly cylindrical, sessile to short pedicellate, without ocular chamber. Ascospores 28–32 × 7.6–8.7 µm (x̄ = 30 × 8 µm, n = 30), bi-seriate, hyaline, fusiform to clavate, straight, curved at both of ends, with a supra-median primary septum, constrict at the septum, upper cell wider and shorter than lower cell, without or with 1-2 large guttules when young, multi-guttulate when mature, smooth-walled, with or without sheath and appendages. Asexual morph: Undetermined. (Descriptions from Bao et al. 2019)

 

Material examined: THAILAND, That Phanom, Nakhon Phanom province, on submerged decaying wood in the Mekong River, 13 November 2018, D.F. Bao, B-163 (MFLU 19–2846, holotype), ex-type culture, MFLUCC 19–0497.

 

References

Bao DF, Hyde KD, Luo ZL, et al (2019) Minutisphaera aquaticum sp. nov. increases the known diversity of Minutisphaeraceae. Asian J Mycol 2:306–314. https://doi.org/10.5943/ajom/2/1/21

 

Fig 1. Minutisphaera aquaticum (MFLU 19–2846, holotype). a, b. Ascomata on submerged wood. c, d. Sections of ascoma. e, f. Peridium. g. Pseudoparaphyses. h–l. Asci. m–p. Ascospores. Scale bars: c, d = 30 μm, e–l = 20 μm, m–p= 10 μm. (Bao et al. 2019)

 

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