Sydowiella Petr., Annls mycol. 21(1/2): 30 (1923)

Index Fungorum number: IF5312; 9 morphological species (Species Fungorum 2020), 5 species with sequence data.

Type species – Sydowiella fenestrans (Duby) Petr.

Notes – Sydowiella are mild pathogens or saprobes characterized by solitarily, erumpent ascomata without stromatic tissues and 2-celled ascospores (Kobayashi 1970). Sydowiella species are mostly distributed in temperate regions (Farr & Rossman 2018). Betula, Centaurea, Dryas, Epilobium, Juncus, Rubus, and Urtica are the common host genera from which Sydowiella species have been collected. In this entry, we illustrate the sexual morph of Sydowiella fenestrans. The asexual morph of Sydowiella has not been reported.