Fungalpedia – Note 690, Placoasterella
Placoasterella Sacc. ex Theiss. & Syd.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Asterinaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic or parasitic on leaves, appearing as blackened circles or irregular areas. Superficial hyphae not observed. Sexual morph: Ascostromata superficial or slightly erumpent on host, scattered or gregarious, carbonaceous, pulvinate and raised, multi-loculate, penetrating cells at host stomata, carbonaceous. Locules erumpent, opening with a pore at the centre. Peridium comprising thick-walled, dark brown to black-walled cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci 8-spored, fissitunicate, bitunicate, ovoid, apedicellate or short pedicellate, apically rounded with a very thick opaque region, lacking ocular chamber. Ascospores overlapping bi-seriate or tri-seriate, ellipsoid to fusoid, 2-layered, hyaline, 1-septum, constricted at septum, upper cell slightly broader than the lower cell, slightly verrucose. Asexual morph: Undetermined (Hongsanan et al. 2014a). with small, solitary, subglobose locules, lacking pseudoparaphyses, ovoid asci and ellipsoid to fusoid ascospores with one septum (Hongsanan et al. 2014a). Müller and von Arx (1962) introduced Placoasterella baileyi and placed it in Asterinaceae.
Note: Theissen and Sydow (1915) introduced Placoasterella with the type species of
P. schweinfurthii recorded from the leaves of Dracaena. Placoasterella is characterized by superficial, circular, flat, black, carbonaceous ascomata
Type species: Placoasterella schweinfurthii (Henn.) Theiss. & Syd., Annls mycol. 13(3/4): 236 (1915)
Other accepted species: species Fungorum – search Placoasterella.
References
Hongsanan S, Li YM, Liu JK et al 2014a – Revision of genera in Asteri- nales. Fungal Divers 68:1–68.
Müller E, von Arx JA 1962 – Beitr Kryptogamenfl Schweiz 11:1–922.
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