Alloconiothyrium Verkley, Göker & Stielow, in Verkley, Dukik, Renfurm, Göker & Stielow, Persoonia 32: 33 (2014)
Index Fungorum number: 818743; Facesoffungi number: FoF 00029, 2 morphological species (Species Fungorum 2021), 2 species with molecular data.
Associated with soil. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial and with a single cavity, or eustromatic and consisting of complexes reaching 1 mm diam, with several cavities, the outer surface black, glabrous or covered by grey mycelium. Conidiomatal wall composed of an outer layer of brown, thick-walled textura angularis and an inner layer of hyaline, thick-walled textura angularis globulosa, the outer surface sometimes covered by a diffuse web of brown hyphae. Conidiogenous cells discrete, often positioned on clumps of cells that protrude into the cavity, broadly ampulliform, holoblastic, annellidic, often with an elongated neck showing several distinct per current proliferations. Conidia globose to irregularly ellipsoid, initially hyaline, after secession olivaceous-brown, mature conidial wall orange-brown, the outer surface verruculose giving the conidium an irregular outline, with 1 large oil-droplet 1–1.5 µm diam, 0-septate. Chlamydospores formed in the mycelium, terminal or intercalary, usually solitary, globose, mostly 6–8.5 µm diam, with a smooth brown wall and 1–2 large oil-droplets (Adapted from Verkley et al. 2014).
Type species: Alloconiothyrium aptrootii Verkley, Göker & Stielow
Notes: Alloconiothyrium was introduced by Verkley et al. (2014) with A. aptrootii as type species. Alloconiothyrium resembles coniothyrium in having annellidic conidiogenous cells and the verruculose conidia but differs in having only 1 large oil-droplet while the type species of Coniothyrium is characterized by 2-celled conidia. Phylogenetically, Alloconiothyrium is a distinct genus and belongs to Didymosphaeriaceae.