Fungalpedia – Note 2779, Kacosphaeria
Kacosphaeria. Speg.
Citation when using this data: Huang SK et al. 2021 – Fungalpedia.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Incertae sedis, Calosphaeriales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on wood. Sexual morph Ascomata perithecial, aggregated, discoid, immersed to erumpent through the bark of the host, black, glabrous, thick-walled, with short necks. Asci 8-spored, unitunicate, clavate, long pedicellate, apex obtuse, with long paraphyses. Ascospores bi-seriate, allantoid, 1-septate, hyaline. Asexual morph Undetermined (adapted from Spegazzini 1888).
Notes: The monotypic Kacosphaeria with clavate asci and allantoid ascospores that is similar to some species of Calosphaeria (Spegazzini 1888). The specific ascogenous hyphae of Calosphaeriales is not mentioned in the description (Spegazzini 1888), nor is it found in the drawings of Spegazzini (Arambarri et al. 2020). Thus, we propose that Kacosphaeria be placed in Calosphaeriales genera incertae sedis, and await more fresh samples pending.
Type species: Kacosphaeria antarctica Speg., Boln Acad. nac. Cienc. Córdoba 11(2): 214 (1887) [1888].
Other accepted species: Species Fungorum – search Kacosphaeria.
Figure 1 – Flabellascus tenuirostris: a, b (redrawn from Réblová et al. 2015). a Asci link with ascogenous hyphae and paraphyses. b Conidiophores with conidia; Kacosphaeria antarctica: c–e (redrawn from Arambarri et al. 2020). c Asci with paraphyses. d Ascospores. e Ascomata. Scale bars: a–d = 10 µm, e = 200 µm.
References
Arambarri AM, Minter TJ, Cabello MN et al 2020 – Spegazzini’s drawings of fungi, a digitized library. www.cybertruffle.org.uk/spegazzini.
Spegazzini C 1888 – Fungi Fuegiani. Boletín De La Academia Nacional De Ciencias En Córdoba 11(2):135–311.
Entry by
Shi-Ke Huang, State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China, The Engineering Research Center of Southwest Bio-Pharmaceutical Resources, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou Province, China, 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, The Mushroom Research Centre, Guizhou University, Guiyang 550025, China
Published online 18 June 2026