Pleosporales » Melanommataceae


Mamillisphaeria K.D. Hyde, S.W. Wong & E.B.G. Jones
Index Fungorum number: IF 27612


Saprobic on submerged wood. Sexual morph: Ascomata scattered to gregarious, superficial, conical, dark brown to black, carbonaceous, with ostiolate papilla, under a pseudostroma that forms a thin layer on the host surface. Peridium thick, composed of several layers of compressed, hyaline cells, with palisade-like cells at the sides. Pseudoparaphyses dense, trabeculate, long, hyaline, septate, branching and anastomosing above the asci, embedded in a gelatinous matrix. Two types of asci and ascospores: TYPE 1: Asci 8-spored, bitunicate, fissitunicate, cylindro-clavate, short pedicellate, apically rounded with an ocular chamber. Ascospores 2–4-seriate, ellipsoidal, hyaline, 1-septate, symmetric, with pad-like, mucilaginous appendage at each end and with some mucilage associated around the spore. TYPE 2: Asci 8-spored, bitunicate, fissitunicate, cylindrical, pedicellate, with an ocular chamber and faint apical ring. Ascospores uni- to bi-seriate, ellipsoidal-fusoid, brown, 1-septate, asymmetric, with a thin mucilaginous sheath (Tian et al. 2015). Asexual morph: Undetermined .


Type species: Mamillisphaeria dimorphospora K.D. Hyde, S.W. Wong & E.B.G. Jones


Notes: The monotypic genus Mamillisphaeria is typified by a freshwater species M. dimorphospora which is strikingly characterized by dimorphic ascospores (Hyde et al. 1996), reminiscent of Aliquandostipite siamensis (Pang et al. 2002). However, they differ in ascomata (globose to subglobose, with stalk in A. siamensis vs. conical, without stalk in M. dimorphospora) and sheath (ascospores without sheath in A. siamensis vs. both types of ascospores with mucilaginous sheaths in M. dimorphospora) (Hyde et al. 1996; Pang et al. 2002). Aliquandostipite siamensis clustered in Aliquandostipitaceae, while Tian et al. (2015) placed M. dimorphospora in Melanommataceae but based on morphology. Sequence data of M. dimorphospora is needed to clarify its phylogenetic placement. (Notes from Dong et al. 2020)


List of freshwater Mamillisphaeria species

Mamillisphaeria dimorphospora K.D. Hyde, S.W. Wong & E.B.G. Jones, Nova Hedwigia 62(3–4): 515 (1996)

Freshwater distribution: Australia (Bareen and Iqbal 1994; Hyde et al. 1996; Vijaykrishna and Hyde 2006), Brunei (Ho et al. 2001), Malaysia (Ho et al. 2001)



Bareen FE, Iqbal SH (1994) Seasonal occurrence of fresh-water hyphomycetes on submerged fallen leaves in canal waters. Can J Bot 72:1316–1321

Ho WH, Hyde KD, Hodgkiss JI, Yanna (2001) Fungal communities on submerged wood from streams in Brunei, Hong Kong, and Malaysia. Mycol Res 105:1492–1501

Hyde KD, Wong SW, Jones EBG (1996) Tropical Australian freshwater fungi XI. Mamillisphaeria dimorphospora gen. et sp. and note on freshwater ascomycetes with dimorphic ascospores. Nova Hedwigia 62:513–520

Pang KL, Abdel-Wahab MA, Sivichai S, El-Sharouney HM, Jones EBG (2002) Jahnulales (Dothideomycetes, Ascomycota): a new order of lignicolous freshwater ascomycetes. Mycol Res 106:1031–1042

Tian Q, Liu JK, Hyde KD, Wanasinghe DN, Boonmee S, Jayasiri SC, Luo ZL, Taylor JE, Phillips AJL, Bhat DJ (2015) Phylogenetic relationships and morphological reappraisal of Melanommataceae (Pleosporales). Fungal Divers 74:267–324

Vijaykrishna D, Hyde KD (2006) Inter- and intra-stream variation of lignicolous freshwater fungi in tropical Australia. Fungal Divers 21:203–224


About Freshwater Fungi

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