Austrostigmidium Pérez-Ort. & Garrido-Ben., Lichenologist 47(3): 146 (2015)
Index Fungorum number: IF 807778; Facesoffungi number: FoF 08521, 1 morphological species (Species Fungorum 2021), molecular data unavailable.
Saprobic on host. Sexual morph: Vegetative hyphae present, hyaline to dark brown. Pseudothecia sessile to semi-immersed, globose to subglobose. Pseudothecial wall brown, paraplectenchymatous, ostiolate. Periphyses abundant, short pendant filaments (pseudoparaphyses) present. Asci clavate to subcylindrical, fissitunicate, ocular chamber present, I–, KI–. Ascospores hyaline, not ornamented, 3-septate. Asexual morph: Pycnidia sessile or with one third immersed in the host thallus, conical to subglobose. Conidiogenous cells more or less ampulliform. Conidia hyaline, simple, bacilliform, straight to curved (Adapted from Perez-ortega et al. 2015).
Type species: Austrostigmidium mastodiae Pérez-Ortega & Garrido-Benavent
Notes: Austrostigmidium was introduced by Pérez-Ortega and Garrido-Benavent (2015) with A. nectandrae as type species. Austrostigmidium is characterized by the presence of black pseudothecia, pseudoparaphyses, fissitunicate, I2, KI2 asci and 3-septate hyaline ascospores. Austrostigmidium resembles Pseudostigmidium but differs on the structure of the ascomatal wall. Pseudostigmidium comprises of a peridium that is composed of a network of more or less radial torulose hyphae (Etayo & Sancho 2008), while Austrostigmidium has a paraplectenchymatous wall composed of polygonal cells. Austrostigmidium also resembles Stigmidium in having hyaline to dark brown vegetative hyphae, paraplectenchymatous wall, bitunicate asci with an ocular chamber and an apical apparatus. Austrostigmidium is accommodated in Teratosphaeriaceae based on morphological characters and phylogenetic analyses (Pérez-Ortega and Garrido-Benavent 2015).