Yoshinagella
Yoshinagella Höhn., Sber. Akad. Wiss. Wien, Math. -naturw. Kl., Abt. 1 122: 293 (1913).
Index Fungorum number: IF 5860; Facesoffungi number: FoF 00137, 2 morphological species (Species Fungorum 2022), no molecular data available.
Parasitic on upper surface of living leaves. Sexual morph: Ascostromata solitary, scattered to gregarious, superficial, cushion-like, flat, rounded, irregular at the margin, black, coriaceous, flattened at the centre. Locules immersed in the ascostromata, arranged in a circular margin, globose to irregular. Wall of ascostromata thick, two layered, with outer layer composed of black and thin tissue; inner layer composed of light brown to hyaline, large cells of textura angularis; peridium that surrounds the locules, composed of small hyaline cells intermixed with ascogenous hyphae and pseudoparaphyses. Hamathecium composed of dense, septate, branched, pseudoparaphyses, branching above the asci. Asci 8-spored, bitunicate, cylindrical, with a short furcate pedicel, apically rounded with an apical ocular chamber. Ascospores 1-seriate, fusiform, pointed at the ends, hyaline, 3-septate, smooth-walled. Asexual morph: Unknown (adapted from Dai et al. 2014).
Type species: Yoshinagella japonica Höhn.
Notes: Yoshinagella is characterised by solitary, scattered to gregarious, superficial ascostromata, immersed locules, dense, septate, branched hamathecium, cylindrical, with a short furcate pedicellate asci and 1-seriate, fusiform, pointed at the ends, hyaline, 3-septate ascospores. Yoshinagella resembles Coccoidea and Cookella, in having superficial, circular to subcircular, pulvinate to effuse discoid, and cushion-like, pigmented ascostromata. Yoshinagella differs from Coccoidea in that the latter has locules which grow upwards from the basal portion and opening via an apical ostiole (Eriksson 1981; Inácio and Cannon 2002). Yoshinagella differs from Cookella in that the latter has small locules distributed in the ascostromata while in Yoshinagella locules are arranged in a circle at the margin of the ascostromata (Hyde et al. 2013). Yoshinagella resembles Parmularia in having large, black ascostromata with locules lined at the surface but differs in that the latter has ascostromata with raised areas from the centre while Yoshinagella has thicker ascostromata only raised at the margins (Hyde et al. 2013; Inácio and Cannon 2008). Yoshinagella also differs from Yoshinagaia in having ascomata directly formed on leaves and produces elliptical ascospores without septa (Sivanesan and Hsieh 1995). Dai et al. (2014) suggested that Yoshinagella might belong to Botryosphaeriaceae or Dothideales but this needs confirmation with molecular data. Dai et al. (2014) designated a specimen from FH 00301624! as lectotype. Dai et al. (2014) retained Yoshinagella in Dothideomycetes genera incertae sedis. In this study, we illustrate a specimen (BISH 608789) from Japan, Seto Inland Sea on leaves of Quercus stenophylla (Fagaceae) and designate it as a reference specimen based on the same host and location as the lecotype material (Dai et al. 2014). We retain Yoshinagella in Dothideomycetes genera incertae sedis until molecular data becomes available. Fresh collections with DNA sequence data are needed to confirm the systematic position of Yoshinagella.
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