Amplistroma Huhndorf, A.N. Mill., Greif & Samuels, Mycologia 101(6): 907 (2009)
Sordariomycetes order incertae sedis, Amplistromatales, Amplistromataceae, Amplistroma
Index Fungorum number: IF513239; 9 morphological species (Species Fungorum 2020); 6 species with sequence data.
Saprobic on bark or wood. Sexual morph: Stromata superficial, turbinate, obovoid to irregularly pulvinate, texture soft or firm. Ascomata globose or subglobose, arranged in multiple layers, with long necks. Peridium outwardly comprising thin-walled, light brown cells of textura intricata and inwardly comprising thin-walled, hyaline cells of textura intricata. Paraphyses abundant, hyaline, filamentous. Asci unitunicate, 8-spored, cylindrical to clavate, pedicellate, apical ring minute to inconspicuous, not staining in Melzer’s reagent. Ascospores uniseriate, unicellular, hyaline, globose, thick-walled. Asexual morph: Hyphomycetous, acrodontium-like in culture and occurring on young stromata and near base of older stromata. Conidiophores generally arising vertically, occasionally horizontally, hyaline to pale brown, not strongly differentiated, with whorls of secondary and tertiary branching, arising vertically along the length. Conidiogenous cells arising in verticils or whorls on the branches, lageniform to ampulliform, apex forming elongate rachis, proliferating sympodially, flexuous, with denticulate, blunt, conidiogenous pegs. Conidia pale brown, pyriform to obovoid, with basal frill (adapted from Maharachchikumbura et al. 2016).
Type species: Amplistroma carolinianum Huhndorf, A.N. Mill., Greif & Samuels, Mycologia 101(6): 907 (2009)
Notes: Amplistroma was introduced by Huhndorf et al. (2009) as sister to Wallrothiella. Members are saprobes with hyphomycetous, acrodontium-like asexual morphs.
Species illustrated in this entry:
Amplistroma erinaceum Checa, M.N. Blanco & G. Moreno