Fungalpedia – Note 2129, Johansonia
Johansonia. Sacc.
Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Johansoniaceae, Capnodiales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Notes – The genus is associated with brown spots on leaves, and is characterised by superficial, solitary, pulvinate, dark brown to black ascomata, lacking ostiole, brown, straight to curved ascomatal setae, with basal T-cell devoid of rhizoids, acutely to obtusely rounded, apical septum, hypha-like, septate, branched pseudoparaphyses, subcylindrical to clavate asci, with short furcate pedicel and an ocular chamber, ovoid to ellipsoidal, septate ascospores (Doilom et al. 2018). The asexual morph is undetermined. Johansonia was placed in Schizothyriaceae, Saccardiaceae and Phillipsiellaceae (Müller & von Arx 1962, von Arx & Müller 1975, Barr 1993b). Wijayawardene et al. (2018) accepted this genus in Saccardiaceae. However, molecular data show that this genus is a member of Capnodiales and should be placed in its own family (Doilom et al. 2018).
Type species: Johansonia setosa (G. Winter) Sacc.
Other accepted species: Species Fungorum – search Johansonia.
Figure 1 – Johansonia setosa (S-F5991, isotype). a Herbarium label and specimen. b, c Ascomata on leaf surface. d Setae. e, f Vertical section through an ascoma stained in lactophenol cotton blue. g Pseudoparaphyses. h, i Ascospores. j, k Asci. Scale bars: b, c = 300 μm, e = 100 μm, f = 30 μm, d = 20 μm, g, j, k = 10 μm, h, i = 5 μm.
References
Barr ME. 1993b – Redisposition of some taxa described by J.B. Ellis. Mycotaxon 46, 45–76.
Müller E, von Arx JA. 1962 – Beitrage zur Kryptogamenflora der Schweiz 11, 1–922.
Entry by
Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand
Published online 23 March 2026