Fungalpedia – Note 640, Eumela
Eumela Syd.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank
Classification: Pseudoperisporiaceae, Incertae sedis, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic and biotrophic on living leaves. Superficial mycelium irregular, black, forming a network, composed of dark brown to pale brown, simple or branched, septate, hyphae, sometimes forming haustoria in epidermal cells. Hairy hyphae longer than 100 μm, pale brown to dark brown, simple, unbranched, numerous, straight or curved, septate, gradually paler upwards, flexuous, slightly constricted at the septa, apex rounded. Sexual morph: Ascomata superficial, solitary to scattered, sessile, small, globose to subglobose, black to dark brown, papillate, surrounded by brown to dark brown, undulate, branched, septate hyphal appendages. Peridium comprising brown cells of textura angularis to subglobosa, thick-walled. Hamathecium lacking pseudoparaphyses or hyaline, sterile, filamentous, paraphysoids (Farr 1984). Asci 4–8-spored, bitunicate, obclavate, ellipsoid, broadly clavate, cylindrical to nearly ellipsoidal, sessile, slightly thickened and bluntly rounded near the apex. Ascospores multi-seriate, overlapping, oblong to ovoid oblong, ends rounded, 1-septum, slightly constricted at the septum, hyaline to olivaceous or brown, smooth-walled. Asexual morph: Pycnidia small, indistinct ostiole or irregularly open pore at the top. diam. densely interlaced with yellow–brown cells, rarely darker in colour, covered inside by a thin hyaline layer, indistinct and minutely cellular. Conidia hyaline, continuous, oblong or shortly basal, obtuse, straight or gently curved (Sydow 1925; Boonmee et al. 2017; Pem et al. 2019).
Notes: Sydow (1925) established Eumela with the type species of E. chiococcae. This genus is characterized by superficial ascomata, with appendaged hyphae, broadly obovoid asci, with hyaline to smoky or brown, 1-septum ascospores (Boonmee et al. 2017). Species of Eumela are morphologically similar to Episphaerella, Eudimeriolum and Lasiostemma but differ from these genera in having hyphae penetrating the epidermal cells, stromata as well as guard cells forming haustoria. Lumbsch and Huhndorf (2010) placed this genus in Pseudoperisporiaceae and this was accepted by Hyde et al. (2013). Boonmee et al. (2017) re-examined the herbarium specimens (holotype and isotype) of E. chiococcae and placed this genus in Dothideomycetes incertae sedis. Later, Pem et al. (2019) included this genus in Antennulariellaceae based on its morphology. Eumela is morphologically similar to Antennulariella by its small, dark brown to black, globose to sub globose ascomata with hyphal appendages and 1-septum ascospores. However, it differs from by its immature sessile ascomata, olivaceous or brown ascospores and superficial hyphae forming haustoria. Sydow (1925) described the asexual morph of Eumela chiococcae and we couldn’t find any protologue in literature.
Type species: Eumela chiococcae Syd., Annls mycol. 23(3/6): 335 (1925).
Other accepted species: Species Fungorum – search Eumela.
References
Hyde KD, Jones EBG, Liu JK et al 2013 – Families of Dothideomycetes. Fungal Divers 63:1–313.
Lumbsch HT, Huhndorf SM 2010 – Outline of Ascomycota 2009. Myconet 14:1–64.
Sydow H 1925 – Fungi in itinere costaricensi collecti. Pars Prima. Ann Mycologici 23:308–429.
Entry by
Diana Sandamali Marasinghe, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand, Mushroom Research Foundation, 128 M.3 Ban Pa Deng T. Pa Pae, A. Mae Taeng, Chiang Mai, 50150, Thailand
Published online 29 August 2023