Johansonia
Johansonia Sacc., Syll. fung. (Abellini) 8: 785 (1889).
Index Fungorum number: IF 2533; Facesoffungi number: FoF 07635, 13 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on leaves, and associated with brown spots on leaves. Sexual morph: Ascomata superficial, on lower leaf surface, situated on a hyphal stroma, loose on the surface, scattered, solitary, pulvinate, dark brown to black, with brown setae. Setae pale brown to brown, separate, surrounding ascomata, erect, straight to curved, thick-walled and smooth-walled, with basal T-cell devoid of rhizoids, slightly constricted at the septa, tapering towards the apex, acutely to obtusely rounded, apical septum. Peridium comprising brown cells arranged in a textura angularis to textura globulosa. Hamathecium comprising, septate, hypha-like, branched, pseudoparaphyses, intermingled among asci. Asci 8-spored, bitunicate, subcylindrical to clavate, with short furcate pedicel, thick-walled, with an ocular chamber. Ascospores 2–3-seriate, hyaline, ovoid to ellipsoidal, septate, slightly constricted at the septa, slightly curved, thick-walled, apical cell wider than basal cell, slightly rounded at both ends. Asexual morph: Unknown (adapted from Doilom et al. 2018).
Type species: Johansonia setosa (G. Winter) Sacc.
Notes: Johansonia is characterised by dark brown to black ascomata, pale brown to brown setae, subcylindrical to clavate asci and 2–3-seriate, hyaline, ovoid to ellipsoidal, septate ascospores. Johansonia was previously assigned to Schizothyriaceae by Müller and Arx (1962). Later, Arx and Müller (1975) referred Johansonia to Saccardiaceae while Barr (1993) placed it in Phillipsiellaceae. Lumbsch and Huhndorf (2007) and Wijayawardene et al. (2018) listed Johansonia in Saccardiaceae, Ascomycota, family incertae sedis. Johansonia is distinct from Orthobellus, the second genus in Johansoniaceae in having superficial discoid ascomata lacking hyphae at the base and subcylindrical to clavate asci. Doilom et al. (2018) examined an isotype of Johansonia setosa and placed it in Johansoniaceae based on morphology and phylogenetic analysis of Crous et al. (2010).
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