Dictyonella erysiphoides (Rehm) Höhn. [as ‘erisyphoides’], Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 118: 369 [95 repr.] (1909)
Index Fungorum number: IF 163806; MycoBank number: MB 163806; Facesoffungi number: FoF04628
≡ Cookella erysiphoides Rehm, Hedwigia 40: 169 (1901)
Epiphytic on the lower surface of leaves. Sexual morph: Ascostromata 60–145 µm high × 185–305 µm diam. (x̄ = 105 × 240 µm, n = 15), superficial, black, rough, sub-carbonaceous, scattered, solitary on the lower surface of the leaf, hemispherical, pulvinate, surrounded by brown mycelial network forming plectenchymatous tissue, subiculum, ostiole not seen. Hamathecium lacking paraphyses. Asci 35–60 × 25–45 µm (x̄ = 52 × 35 µm, n = 15), 8-spored, bitunicate, globose to subglobose, short pedicellate or apedicellate, apically rounded with indistinct ocular chamber. Ascospores 22–30 × 8–12 µm (x̄ = 25 × 10 µm, n = 20), crowded, muriform, ellipsoid to oblong, hyaline when immature, becoming brown at maturity, obtuse at both ends, with 3–5 transverse septa and 4–7 longitudinal septa, slightly constricted at middle septum, smooth-walled. Asexual morph: Undetermined. (Doilom et al. 2018)
Material examined – BRAZIL, Rio de Janeiro, Tijuca, on Coccoloba sp. (Polygonaceae), November 1897, E. Ule (S-F12211, holotype).
Figure 1 – Dictyonella erysiphoides (S-F12211, holotype). a Herbarium label and specimen. b Ascomata on host. c Close up of ascomata. d Ascomata with basal hypha. e Vertical section through ascoma. f Ascoma with hyphae. g Hyphae. h–j Asci with ascospores. Note: i stained in lactophenol cotton blue. k–m Ascospores. Scale bars: c, f = 100 µm, d = 200 µm, e = 50 µm, g–m = 20 µm.