Fungalpedia – Note 677, Cirsosiopsis
Cirsosiopsis Butin & Speer.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Microthyriaceae, Microthyriales, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic and parasitic on leaves. Superficial hyphae composed of brown, reticulate, similar to intercalary appressoriate hyphae forming intracellular hyphae. Sexual morph: Thyriothecia superficial, solitary to gregarious, confluent, carbonaceous to membranous, strongly flattened, discoid or pulvinate to elongate, opening by irregular pore. Upper wall composed of dark brown to brown cells of textura prismatica branching at the margins. Hamathecium compose of hyaline, filiform, aseptate, pseudoparaphyses with rounded ends. Asci 8-spored, bitunicate, fissitunicate, cylindrical, or globose to subglobose, short pedicellate with a distinct ocular chamber. Ascospores 2–3-seriate, hyaline to olivaceous-brown, fusiform, ellipsoid to ovate, ends rounded, 1-septum, constricted at the septum, thick-walled with a sheath, with two large angular guttules, pointed at the apex. Asexual morph: Undetermined.
Notes: Butin and Speer (1978) introduced Cirsosiopsis and formally placed the genus in Dimeriaceae based on the superficial hyphae with nodes. However, Lumbsch and Huhndorf (2010) also placed this genus in Microthyriaceae. The superficial, brown, intercalary hyphae and the radially arranged cells of the upper wall resemble Asterinaceae. However, the pseudoparaphysate hamathecium, carbonaceous pulvinate ascomata resemble Parmulariaceae. Wu et al. (2014) re-examined the holotype and suggested placing the genus in Parmulariaceae due to its carbonaceous and pulvinate ascomata. Butin and Speer (1978) observed superficial hyphae with nodes in the holotype and we could not observe them in the illustration of Wu et al. (2014). We accepted this genus in Parmulariaceae based on morphology until further investigations with molecular data.
Type species: Cirsosiopsis violacescens Butin & Speer, Sydowia 31 (1–6): 10 (1979) [1978]
Other accepted species: species Fungorum – search Cirsosiopsis.
References
Lumbsch HT, Huhndorf SM 2010 – Outline of Ascomycota 2009. Myconet 14:1–64.
Wu HX, Tian Q, Li WJ et al 2014 – A reappraisal of Microthyriaceae. Phytotaxa 176:201–212.
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