Anteagloniaceae K.D. Hyde, J.K. Liu & A. Mapook, fam. nov. MycoBank: MB 804658
Saprobic on dead wood. Sexual state: Ascomata hysterothecial, superficial or sunken in substrate, oval to elongate, or globose to subglobose, black, carbonaceous, straight or curved, rarely branched, without subiculum. Ostiole central, slit-like. Peridium thick, dark brown, comprising a single stratum of dark brown cells of textura epidermoidea. Hamathecium comprising 1.4–1.5 μm wide, cylindrical to filiform pseudoparaphyses in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, elongate cylindric-clavate, straight or slightly curved, short- pedicellate, apically rounded, with an ocular chamber. Ascospores uniseriate, 2-celled, very small, ellipsoidal, hyaline, 1-septate, constricted at septa, widest at the middle and tapering towards the narrow ends,straight, smooth-walled. Asexual state: Unknown.
Typus : Anteaglonium Mugambi & Huhndorf
Notes : Although the ascomata of Anteaglonium are hysteriothecial and characteristic of Hysteriaceae, the genus was shown to cluster as a distinct lineage in Pleosporales (Mugambi and Huhndorf 2009a, b) showing a parallel evolution of hysterothecial ascomata in Dothideomycetes. A similar topology was shown in the study of Schoch et al. (2009a), Zhang et al. (2012a), Mugambi and Huhndorf (2009b) and is confirmed in analysis. We therefore introduce a new family to accomodate this distinct lineage. Anteaglonium comprises four species in Index Fungorum (2013).
Type : Anteaglonium Mugambi & Huhndorf, Syst. Biodiv. 7(4): 460 (2009)
Type species : Anteaglonium abbreviatum (Schwein.) Mugambi & Huhndorf, Syst. Biodiv. 7(4): 460 (2009)
≡ Hysterium abbreviatum Schwein., Trans. Am. phil. Soc., Ser. 2 4(2): no. 2094 (1832)

Fig. Anteaglonium abbreviatum (Material examined: USA, Tennessee, Sevier County, Great Smoky Mountains National Park, Cherokee Orchard, vic. of Gatlinburg, Trillium tral, 35° 40′ 30.88″W, 780 m elev., on wood, branch, on ground, 1″ diam., A.N. Miller et al., 12 July 2004, ANM 37). a Herbarium specimen. b Ascomata on host surface. c Section through ascoma. d Peridium. e Pseudoparaphyses. f-h Immature and mature asci. Note fissitunicate ascus and strained by lactophenol cotton blue (see in h). i–l Ascospores. Scale bars: b =500μm, c= 50μm, f–h =20μm, d =10, e, i–l =5μm