Fungalpedia – Note 2495, Ascominuta

 

Ascominuta Ranghoo & K. D. Hyde

Citation when using this data: Dong W et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

Classification: Natipusillaceae, Natipusillales, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

Saprobic on submerged wood. Sexual morph: Ascomata solitary or aggregated, partly immersed to superficial, uniloculate, globose, dark brown to black, ostiolate, periphysate. Peridium composed of several layers of hyaline to dark brown, compressed cells of textura angularis. Pseudoparaphyses sparse, cellular, comprising short chains of globose cells, often breaking up into individual cells. Asci 4-spored, bitunicate, globose, short or non-pedicellate, without an apical apparatus. Ascospores overlapping multiseriate, broadly fusiform or ovoid, occasionally curved, hyaline, 1-septate, constricted at the septum, smooth-walled, with a distinct sheath (Ranghoo and Hyde 2000; Hu et al. 2010a). Asexual morph: Undetermined.

Notes: Ascominuta comprises two freshwater species, characterized by globose asci containing four spores and broadly fusiform or ovoid, hyaline, 1-septate ascospores with a distinct sheath (Ranghoo and Hyde 2000; Hu et al. 2010a). Ascominuta was probably an earlier name for Natipusilla based on morphology and habitat (see notes of Natipusilla) (Hyde et al. 2013), but needs to be established by molecular data. Ascominuta was initially placed in Ascomycetes genera incertae sedis (Ranghoo and Hyde 2000), then placed in Dothideomycetes genera incertae sedis (Lumbsch and Huhndorf 2007), which was accepted by Wijayawardene et al. (2018, 2020). Ascominuta lignicola cannot be aligned with other Dothideomycetous species in our sequence dataset, so we exclude this species from our phylogenetic analyses.

Ascominuta lignicola Ranghoo & K.D. Hyde has broadly fusiform ascospores surrounded by an irregular, mucilaginous sheath, while A. ovalispora D.M. Hu & K.D. Hyde has ovoid ascospores surrounded by sac-like, persistent sheath. Ascominuta lignicola has smaller ascospores than A. ovalispora (Ranghoo and Hyde 2000; Hu et al. 2010a).

Type species: Ascominuta lignicola Ranghoo & K.D. Hyde.

Other accepted species: Species Fungorum – search Ascominuta.

 

image

 

Figure 1 – Ascominuta spp. a–c A. lignicola (redrawn from Ranghoo and Hyde (2000), HKUM 5246, holotype). a Peridium of ascoma. b Ascus. c Ascospore. d Ascospore of A. ovalispora (redrawn from Hu et al. (2010a), MFLU 08-1176, holotype). Scale bars: a–d = 10 μm.

 

References

Hu DM, Cai L, Chen H, Bahkali AH, Hyde KD (2010a) Four new freshwater fungi associated with submerged wood from Southwest Asia. Sydowia 62:191–203

Hyde KD, Jones EBG, Liu JK, Ariyawansa H, Boehm E, Boonmee S, Braun U, Chomnunti P, Crous PW, Dai DQ, Diederich P, Dissanayake A, Doilom M, Doveri F, Hongsanan S, Jayawardena R, Lawrey JD, Li YM, Liu YX, Lücking R, Monkai J, Muggia L, Nelsen MP, Pang KL, Phookamsak R, Senanayake I, Shearer CA, Suetrong S, Tanaka K, Thambugala KM, Wijayawardene NN, Wikee S, Wu HX, Zhang Y, Aguirre-Hudson B, Alias SA, Aptroot A, Bahkali AH, Bezerra JL, Bhat DJ, Camporesi E, Chukeatirote E, Gueidan C, Hawksworth DL, Hirayama K, Hoog SD, Kang JC, Knudsen K, Li WJ, Li XH, Liu ZY, Mapook A, McKenzie EHC, Miller AN, Mortimer PE, Phillips AJL, Raja HA, Scheuer CH, Schumm F, Taylor JE, Tian Q, Tibpromma S, Wanasinghe DN, Wang Y, Xu JC, Yan JY, Yacharoen S, Zhang M 2013 – Families of Dothideomycetes. Fungal Divers 63:1–313.

Lumbsch HT, Huhndorf SM 2007 – Outline of ascomycota–2007. Myconet 13:1–58.

Ranghoo VM, Hyde KD 2000 – Ascominuta lignicola, a new loculoascomycete from submerged wood in Hong Kong. Mycoscience 41:1–5.

Wijayawardene NN, Hyde KD, Lumbsch HT, Liu JK, Maharachchikumbura SSN, Ekanayaka AH, Tian Q, Phookamsak R 2018 – Outline of Ascomycota: 2017. Fungal Divers 88:167–263.

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Entry by

Wei Dong, Faculty of Agriculture and Food, Kunming University of Science and Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Institute of Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China

 

Published online 22 May 2026

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