Austrostigmidium
Austrostigmidium Pérez-Ort. & Garrido-Ben., Lichenologist 47(3): 146 (2015).
Index Fungorum number: IF 811127; Facesoffungi number: FoF 08521, 1 morphological species (Species Fungorum 2022), no molecular data available.
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 Pérez-Ortega et al. 2015).
Type species: Austrostigmidium mastodiae Pérez-Ortega & Garrido-Benavent
Notes: Austrostigmidium is characterised by the presence of black pseudothecia, pseudoparaphyses, fissitunicate, I2, KI2 asci and 3-septate hyaline ascospores. Austrostigmidium resembles Pseudostigmidium but differs in the structure of the ascomatal wall. Pseudostigmidium has a peridium that is composed of a network of more or less radial torulose hyphae (Etayo and 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).
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