Fungalpedia – Note 1038, Yatesula
Yatesula Syd. & P. Syd.
Citation when using this data: Tian Q et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Chaetothyriaceae, Chaetothyriales, Chaetothyriomycetidae, Eurotiomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on leaves in terrestrial habitats. Mycelium lacking. Sexual morph: Ascomata superficial, gregarious, or some solitary, slightly raised, circular, black, coriaceous. Wall of ascoma thick at the apex and thin at the base, single layer, comprising pigmented, thick-walled cells. Hamathecium lacking paraphyses. Asci mainly 4–8-spored, bitunicate, fissitunicate, dehiscence not observed, obclavate to cylindrical, with short pedicel, ocular chamber not observed. Ascospores overlapping 2–3-seriate, oblong, fusiform to clavate, hyaline, slightly yellowish-brown, straight or curved, 1–4-septate, constricted at the septa, straight or slightly curved, smooth-walled, with a gelatinous sheath. Asexual morph: Undetermined.
Notes: Yatesula Syd. & P. Syd. is characterized by circular, coriaceous ascomata with superficial mycelium, bitunicate, obclavate to cylindrical asci and oblong, fusiform to clavate, 1–4- septate ascospores with a gelatinous sheath. Yatesula lacks setae and periphyses (Sydow & Sydow 1917, Pereira-Carvalho et al. 2009). The obclavate to cylindrical asci and fusiform to clavate, hyaline, 1–4-septate ascospores are more typical of Dothideomycetes in Mycosphaerellaceae Lindau. However, the ascomata lack trabeculate pseudoparaphyses (sensu Liew et al. 2000) which excludes Yatesula from this family and order. We, therefore, exclude this genus pending fresh collection and DNA sequence data.
Type species: Yatesula calami Syd. & P. Syd., Annls mycol. 15(3/4): 237 (1917).
Other accepted species: Species Fungorum – search Yatesula.
Figure 1 – Yatesula calami (S-F5690, holotype). a Envelop and collection information of Yatesula calami. b Herbarium specimen. c, d Appearance of black ascomata on the host. e Squash mount of ascoma. f, g Section of ascomata. h Vertical section through ascoma wall. i–m Asci with ascospores. n–p Ascospores. Scale bars: c = 500 µm, d = 200 µm, e = 50 µm, f–g = 20 µm, h, j–p = 5 µm, i = 10 µm.
References
Sydow H, Sydow P. 1917 – Novae fungorum species-XV. Annales Mycologici 15, 143–148.
Entry by
Qing Tian, 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
Published online 16 December 2021