Oedohysterium insidens
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) [1834].
Index Fungorum number: IF 515422; Facesoffungi number: FoF 11442, Fig. 1
Description:
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 pseudo paraphyses, 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: The United States, Indiana, Lawrence, Hoosier National Forest, Hickory Ridge Trails, on decorticated wood, 7 November 1998, JL Crane (ILLS00166081).
Fig. 1. Hysterium insidens (ILLS00166081). a–d. Herbarium material and appearance of hysterothecia on the host. e. Section through hysterothecia. d. Peridium. e. Cellular pseudoparaphyses. h–l. Asci. m–q. Ascospores. Scale bars: c = 5000 μm, d = 1000 μm, e = 100 μm, f, h–l = 50 μm, m–q = 20 μm.
Importance and distribution
Oedohysterium comprises three species. Oedohysterium insidens has been found from bark and old wood of Pinus (Pinaceae), Larix (Pinaceae), Castanea (Fagaceae), Quercus (Fagaceae), Eucalyptus (Myrtaceae), Fraxinus (Oleaceae), Aspidosperma (Apocynaceae) and Lavandula (Lamiaceae) and reported mainly from North and South America, and Europe (Italy) (Zogg 1962, Boehm et al. 2009). Oedohysterium sinense is known on decorticated hardwood trees, structures such as aged fence posts and has been reported from Asia (China), Europe and North America. Oedohysterium pulchrum is reported on bark of branch in South America (Brazil (Costa Rica)).
References
Boehm EWA, Mugambi GKM, Miller AN, Huhndorf SM et al. 2009 – A molecular phylogenetic reappraisal of the Hysteriaceae, Mytilinidiaceae and Gloniaceae (Pleosporomycetidae, Dothideomycetes) with keys to world species. Studies in Mycology 64, 49–83.
Zogg H. 1962 – Die Hysteriaceae s. str. und Lophiaceae, unter besonderer Berücksichtigung der mitteleuropäischen Formen. Beiträge zur Kryptogamenflora der Schweiz Band 11, 1–190.
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