Fungalpedia – Note 2240, Metathyriella
Metathyriella Syd.
Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Schizothyriaceae, Mycosphaerellales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Metathyriella was introduced to accommodate an epiphytic fungus occurring on leaves of Roupala veraguensis (Proteaceae). The genus was originally described as thyriothecial, dimidiate-scutate, or orbicular ascomata, with irregular loose margin and indistinct basal membrane, the membrane covered by flattened, soft convex layer, irregularly lumpy at maturity, yellowish-brown to olive-brown, later more or less intense, periphery in a subhyaline membrane matrix, anastomosed paraphyses. Asci are 8-spored, bitunicate, ellipsoidal, or broadly ovoid to subglobose asci and ascospores are amalgamated, oblong-clavate, and 2-septate (Sydow 1927, Phookamsak et al. 2016). Sydow (1927) accommodated Metathyriella in Hemisphaeriaceae, however, von Arx & Müller (1975) placed it in Schizothyriaceae. Metathyriella is a poorly known genus, there are only three species and there is no molecular data to clarify its phylogenetic affinities. The type specimen of M. roupalae could not be located. Hence, Phookamsak et al. (2016) treated Metathyriella as a doubtful genus. However, Wijayawardene et al. (2018) placed the genus in Schizothyriaceae until the genus is clarified based on molecular data.
Type species: Metathyriella roupalae Syd., Annls mycol. 25(1/2): 96 (1927)
Other accepted species: Species Fungorum – search Metathyriella.
References
Sydow H. 1927 – Fungi in itinere costaricense collecti. Annales Mycologici 25(1–2), 1–160.
Entry by
Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand
Published online 25 March 2026