Pleosporales » Melanommataceae » Mamillisphaeria

Mamillisphaeria dimorphospora

Mamillisphaeria dimorphospora K.D. Hyde, S.W. Wong & E.B.G. Jones

Index Fungorum number: IF 415619


Following description is adapted from Hyde et al. 1996)


Sexual morph: Ascomata 455650 μm high × 980–1430 μm diam., scattered or in small groups, superficial, conical, carbonaceous, papillate, under pseudostroma which forms a thin layer on the host surface, up to 50 μm thick between the ascomata and 125–250 μm thick on the ascomata surface. Peridium 10–25 μm thick, comprising several layers of compressed, densely packed, thin-walled, hyaline cells. A wedge-shaped area of vertically orientated hyaline palisade-like cells occurs at the periphery. Hamathecium of dense, trabeculate pseudoparaphyses, ca. 1 μm broad, hyaline, branching and anastomosing, septate, embedded in mucilage. Two types of asci and ascospores exist in the same ascoma: TYPE 1: asci 185320 × 40–100 μm (x̄ = 210 × 78μm, n = 50), 8-spored, cylindro-clavate, bitunicate, fissitunicate, short-pedicellate, with an ocular chamber (to 13 μm wide × 5 μm high). Ascospores 66–84 × 20–38 μm (x̄ = 78 × 25μm, n = 50), 2-4-seriate, hyaline, ellipsoidal, constricted at the central septum, with pad-like mucilaginous appendage at each end and with some mucilage associated around the spore, and TYPE 2: asci 158–242 × 8–15 μm (x̄ = 182 × 11μm, n = 50), 8-spored, cylindrical, bitunicate, fissitunicate, pedicellate, with an ocular chamber and faint apical ring, ascospores 29–42 × 6–9 μm (= 35 × 7μm, n = 50), 1-2-seriate, brown, ellipsoidal-fusoid, surrounded by a thin mucilaginous sheath. Asexual morph: Undetermined. (Description from Zhang et al. 2012).


Material examined: BRUNEI, on submerged wood, Aug. 1997, leg. K.D. Hyde (HKU(M) 7425).


Freshwater distribution: Australia (Bareen and Iqbal 1994; Hyde et al. 1996; Vijaykrishna and Hyde 2006), Brunei (Ho et al. 2001), Malaysia (Ho et al. 2001)