Atractosporaceae Zhang et al.
Saprobic on submerged deciduous wood. Sexual morph: Ascomata solitary or aggregated in small groups, immersed or semi-immersed to superficial, astromatic, subglobose to conical, dark brown to black, with a lateral neck, often lying horizontally on the substrate surface. Ostiole periphysate. Peridium leathery to fragile, two-layered. Paraphyses abundant, persistent, cylindrical. Asci 8-spored, unitunicate, pedicellate, apically rounded or obtuse, with a J-, relatively small, apical ring. Ascospores uniseriate, hyaline, fusiform, aseptate or transversely septate, smooth or ornamented. Asexual morph: Undetermined (adapted from Zhang et al. 2017).
Type genus: Atractospora Réblová & J. Fourn.
Notes: Atractosporaceae was introduced in a new order Atractosporales by Zhang et al. (2017) with two genera i.e. Atractospora and Rubellisphaeria. Although Aquaticola hongkongensis also nested in Atractosporaceae (Zhang et al. 2017), it has never been validly published (Ranghoo et al. 1999). This species needs to be recollected and characterized. This family represents a distinct group of freshwater Sordariomycetes, which is strongly supported by its stem age, ca 98 MYA in the MCC tree (Hyde et al. 2017). Atractosporaceae is similar to Pseudoproboscisporaceae in the ascomata often lying parallel to the host surface. However, the ascospores of Atractosporaceae lack appendages, unlike in Conlariaceae and Pseudoproboscisporaceae which have appendages at one or both ends. We illustrate Atractospora thailandensis.
Hyde KD, Maharachchikumbura SSN, Hongsanan S, Samarakoon MC et al. 2017a – The ranking of fungi: a tribute to David L. Hawksworth on his 70th birthday. Fungal Diversity 84, 1–23.
Ranghoo VM, Hyde KD, Liew ECY, Spatafora JW. 1999 – Family placement of Ascotaiwania and Ascolacicola based on DNA sequences from the large subunit rRNA gene. Fungal Diversity 2, 159–168.
Zhang H, Dong W, Hyde KD, Maharachchikumbura SSN et al. 2017a – Towards a natural classification of Annulatascaceae-like taxa: introducing Atractosporales ord. nov. and six new families. Fungal Diversity 85, 75–110