Fungalpedia – Note 682, Hysterostomella
Hysterostomella Speg.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1.
Classification: Parmulariaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Parasitic on leaves. Colonies epiphyllous, superficial, confluent to aggregate, irregular to sub circular even irregular in circumference. Sexual morph: Ascomata black to brown, flattened, orbicular to suborbicular, coriaceous to membranous, opening by irregular fissures, with multi locules, membranous, leathery and upper wall comprising several black layers, ostiolate, inner stroma present. Hamathecium comprises hyaline, septate, filamentous pseudoparaphyes or paraphysoids consisting of a hyaline mucous mass. Asci 8-spored, bitunicate, hyaline, fissitunicate, subglobose, obovoid, clavate, cylindrical clavate, small thick pedicel, obtuse on both ends. Ascospores initially hyaline becoming brown at maturity, ellipsoidal, 1-septum, constricted at the septa, non-granulose coarsely 1-gutulate. Asexual morph: Undetermined.
Notes: Hysterostomella was introduced by Spegazzini (1885) and typified by
H. guaranitica Speg. It is characterized by large, black, circular or elliptical ascomata becoming irregular and rather flat, opening by irregular slits, cylindrical clavate asci and dark brown, ellipsoidal ascospores with a single septum (Inácio and Cannon 2008). Theissen and Sydow (1915) introduced Hysterostomina which resembles Hysterostomella and later Theissen & Doidge (1948) synonymized Hysterostomina under Hysterostomella.
Type species: Hysterostomella guaranitica Speg., Anal. Soc. cient. argent. 19(6): 260 (1885)
Other accepted species: species Fungorum – search Hysterostomella.
Figure 1 – Hysterostomella elaeidicola. a–c Colonies on the leaf surface. d Section through ascomata. e Ascospores. Redrawn from Arnaud (1918)
References
Arnaud G 1918 – Les Astérinées. Annales de l’école Nationale d’agriculture de Montpellier 16:1.
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