Zwackhiomyces Grube & Hafellner, Nova Hedwigia 51(3– 4): 305 (1990).
MycoBank number: MB 25388; Index Fungorum number: IF 25388; Facesoffungi number: FoF 07658; 26 morphological species (Species Fungorum 2020), 1 species with molecular data.
Type species: Zwackhiomyces coepulonus (Norman) Grube & R. Sant., in Grube & Hafellner, Nova Hedwigia 51(3–4): 310 (1990).
≡ Arthopyrenia coepulona Norman, Bot. Notiser: 192 (1868) .
Notes: Zwackhiomyces is one of the most diverse genera of lichenicolous fungi with 35 known species (Diederich et al. 2018). Species mostly grow on crustose lichens with green photobionts, although five species grow on hosts with cyanobacteria as photobiont. Pérez-Ortega et al. (2016) sequenced the type species and confirmed the genus is a member of Xanthopyreniaceae.