Fungalpedia – Note 609, Trichasterina
Trichasterina G. Arnaud
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 on the upper surface of leaves appearing as blackened circular areas. Superficial hyphae of circular, lateral and alternative, sparsely septate appressoria, scattered with superficial thyriothecia and setae. Sexual morph: Thyriothecia solitary to gregarious, superficial, black, easily detached from the host surface, opening with star-like fissures when mature. Upper wall comprising a thin layer of neatly arranged darkened cells branched at the outer rim, poorly developed basal cell layer. Hamathecium lacking pseudoparaphyses. Asci 8-spored, bitunicate, globose to subglobose or clavate, fissitunicate, dehiscence not observed, apical region of asci usually with a thick opaque region, ocular chamber and staining blue in IKI not observed. Ascospores overlapping, conglobate, 1-septum, initially hyaline becoming brown when mature, slightly constricted at the septum. Asexual morph: Undetermined (Hongsanan et al. 2014a).
Notes: Arnaud (1918) established Trichasterina based on T. styracis. It is characterized by superficial orbicular thyriothecia opening by a star-like fissure, globose to subglobose asci, appressorial hyphae with setae and conglobate, 1-septum, brown ascospores (Hongsanan et al. 2014a). The morphology of thyriothecia, ascospores and asci of this genus is similar to Asterina, but differs in having superficial hyphae with setae (Hongsanan et al. 2014a). However, molecular data are needed to confirm its placement and understand the relationship with other genera and species in Asterinaceae.
Type species: Trichasterina styracis (Theiss.) G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1–4): 172 (1918).
Other accepted species: Species Fungorum – search Trichasterina.
References
Arnaud G 1918 – Les Astérinées. Annales de l’école Nationale d’agriculture de Montpellier 16:1.
Hongsanan S, Li YM, Liu JK et al 2014a – Revision of genera in Asterinales. Fungal Divers 68:1–68.
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