Didymocyrtidium nudum
Didymocyrtidium nudum Vain., Acta Soc. Fauna Flora fenn. 49(no. 2): 229 (1921) Fig. 1
Index Fungorum number: IF 557075; Facesoffungi number: FoF 07131
Saprobic on growing stems of Betula sp. Sexual morph: Ascomata 29–40 µm high × 36–43 µm diam., (x̅ = 38.2 × 39.9 µm, n = 10), semi immersed to superficial on host surface, simple, visible as dark brown to black circle on host surface. Peridium 9–11 µm wide thick-walled, composed of several layers of dark-brown cells of textura angularis. Hamathecium 2–3 µm wide present, with cellular pseudoparaphyses, anastomosing, branching, embedded in mucilaginous matrix, sometimes aparaphysate, covering asci by gelatinous matrix. Asci 30–32 µm × 16–18 µm (x̅ = 31.4 × 17.4 µm, n = 10), bitunicate, fissitunicate, 8-spored, ovoid to saccate, sessile with indistinct ocular chamber, thick-walled. Ascospores 10–12 µm × 3–4 µm (x̅ = 11.5 × 3.9 µm, n = 10), bi-to tri-seriated, or overlapping, oblong to cylindrical or ellipsoid, hyaline to subhyaline 1-septate, very slightly constricted at the septum, smooth or rough-walled. Asexual morph: Undetermined.
Material examined – RUSSIA, on stems of Betula sp. (Betulaceae), 16 July 1928, E. Häyrén (H6022676, syntype)
Economic significance – None is reported.
Figure 1 – Didymocyrtidium nudum (H6022676, syntype). a Details of herbarium material. b, c Habit and appearance of ascomata on host surface. d Section of ascoma. e Peridium. f Hamathecium g–j Asci k–o Ascospores. Scale bars: b, c = 500 µm, d = 50 µm, e = 10 µm, f, k–o = 5 µm, g–j = 20 µm.
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