Oedohysterium insidens (Schwein.) E. Boehm & C.L. Schoch, in Boehm, Mugambi, Miller, Huhndorf, Marincowitz, Spatafora & Schoch, Stud. Mycol. 64: 59 (2009).
≡ Hysterium insidens Schwein., Trans. Am. phil. Soc., New Series 4(2): 244 (1832) .
Index Fungorum number: IF 515422; Facesoffungi number: FoFxxx, Fig. 1
Saprobic on host. Sexual morph: Ascomata 200–285 μm diam., 200–275 μm high, superficial, with a central ostiole, thick-walled, carbonaceous hysterothecia, clearly navicular, comprising a distinct longitudinal slit. Hysterothecia erumpent to entirely superficial, solitary, or gregarious, ellipsoid to significantly elongated. Peridium 20–30 μm 3-layered, comprising globose to obovoid, pseudoparenchymatous cells, the outer layer dark brown, longitudinally striated on the surface, the middle layer lighter in pigmentation and the inner layer clearly thin-walled and compressed. Hamathecium 0.5–1 μm comprising hyaline, aseptate, cellular pseudoparaphyses, in a gelatinous matrix. Asci 114−125 × 17.5−18.9 µm (x̄ = 120.7 × 18.1 µm, n = 10), 8-spored, clavate to cylindric at maturity, bitunicate, fissitunicate, with a distinct ocular chamber. Ascospores 30−40 × 7−8 µm (x̄ = 38.4 × 7.5 µm, n = 10) overlapping bi-seriate, obovoid to clavate, ellipsoid or fusoid, 3- or more transversely-septate, with cells often slightly constricted at the septum, especially the median septum, dark-brown. Asexual morph: Unknown.
Material examined: United States, Indiana, Lawrence, Hoosier National Forest, Hickory Ridge Trails, on decorticated wood, 7 November 1998, JL Crane (ILLS00166081).