Achaetobotrys Bat. & Cif., Saccardoa 2: 49 (1963).
Foliar epiphytes living as sooty molds on insect exudates. Subiculum dark brown to black, effuse, densely velutinous, somewhat dense or velvety, forming on the surface of leaves and twigs. Hyphae deeply pigmented at the margin, cylindrical to moniliform, or regular, septate hyphae with smooth or roughened walls. Erect hyphae dark, broad and irregularly anastomosing in a network, forming a brown to black, dense or scant covering. Sexual morph: Ascomata developing from repeated divisions of hyphae, brown to dark brown, subglobose, obovoid to broadly ellipsoidal, or ovoid, sessile, or with a robust stalk, with or without appendages, ostiolate at maturity, arising from terminal or intercalary cells on aerial hyphae. Peridium thin-walled, pseudoparenchymatous. Asci 8-spored, bitunicate, fissitunicate, small, pyriform to ellipsoidal, or clavate. Ascospores minute, not numerous, irregularly arranged, ovoid, more or less oblong, hyaline, 1–3-septate, slightly constricted at the septa, with the upper half slightly shorter and broader than the lower one, rounded at both ends. Asexual morph: Unknown (adapted from Hyde et al. 2013).
Type species: Achaetobotrys affinis (L.R. Fraser) Bat. & Cif.
Notes: Achaetobotrys was introduced by Batista and Ciferri (1963) with A. affinis as type species. Achaetobotrys is characterised by obovoid to broadly ellipsoidal ascostromata, lacking hyphal appendages (Hyde et al. 2013). Achaetobotrys differs from other genera in Antennulariellaceae in having paler brown ascomata and hyphae with thicker wall. Wijayawardene et al. (2022) accepted this genus in Antennulariellaceae. Achaetobotrys is currently treated as a distinct genus in Antennulariellaceae but molecular data is needed to confirm this placement.