Megalohypha

Fungalpedia – Note 2423, Megalohypha

 

Megalohypha. A. Ferrer & Shearer.

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

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

Classification: Aliquandostipitaceae, Jahnulales, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

 

Saprobic on submerged wood. Sexual morph: Ascomata superficial, uniloculate, globose to obpyriform, hyaline, membranous, with ostiolate papilla, stalked or sessile. Peridium composed of large, hyaline, thin-walled cells. Pseudoparaphyses numerous, trabeculate, filamentous, hyaline, septate, branched, anastomosing above the asci. Asci 8-spored, bitunicate, fissitunicate, broadly clavate or fusiform, short pedicellate, with or without an ocular chamber. Ascospores irregularly arranged, ellipsoidal, acutely tapered at apices, straight, brown to dark brown, 1-septate, symmetrical, rough-walled, longitudinally striate, without appendages or gelatinous sheath (Ferrer et al. 2007). Asexual morph: Undetermined.

Notes: Megalohypha is monotypic with M. aqua-dulces occurring on submerged decorticated wood in Panama and Thailand (Ferrer et al. 2007). Megalohypha can be easily distinguished from Aliquandostipite and Jahnula based on its pale to dark brown, 1-septate, rough-walled ascospores with longitudinally sulcate striations and without appendages or gelatinous sheath (Ferrer et al. 2007). It formed a moderately supported clade with Pseudojahnula (Hyde et al. 2019).

 

Type species: Megalohypha aqua-dulces A. Ferrer & Shearer.

Other accepted species: Species Fungorum – search Megalohypha.

 

 

Figure 1 – Megalohypha aqua-dulces (AF005). f Ascoma on substrate. g Ascus. h, i Ascospores. j Broad hyphae in PDA. Scale bars: a–e, g–i = 20 µm, f, j = 200 µm

 

References

Ferrer A, Sivichai S, Shearer CA (2007) Megalohypha, a new genus in the Jahnulales from aquatic habitats in the tropics. Mycologia 99:456–460

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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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