Dibaeis Clem.
Type : Dibaeis baeomyces (L.f.) Rambold & Hertel [Lichen baeomyces L.f.]
Description : Thallus crustose, scurfy, ecorticate to ±varnish-like, attached by medullary hyphae. Photobiont green, Coccomyxa. Ascomata apothecia, ±sessile to stalked, the stalk unlichenised; discs whitish pink, rose-pink to orange-pink, plane to globose, with or without pruina, thinly marginate or immarginate. Epithecium containing colourless crystals. Hymenium colourless I+ blue. Hamathecium of simple or sparingly branched paraphyses. Asci with a thin, I+ blue apical cap. Ascospores hyaline, ellipsoidal, fusiform or allantoid, simple or transversely 1–3-septate. Conidiomata pycnidia, immersed. Conidia short, bacillar, 4–6 × 1–1.5 μm.
Pink-fruited species of Baeomyces s. lat. were referred to Dibaeis Clem. (Gierl & Kalb 1993), and placed in the family Icmadophilaceae (Rambold et al. 1993; Johnston 2001b; Ryan & Kalb 2002; Eriksson et al. 2004; Pennycook & Galloway 2004; Eriksson 2005), a view that has received support from molecular studies (Platt & Spatafora 1999; Stenroos et al. 2002c). The genus comprises 15 species, one (the type species of the genus) with an holarctic distribution, the remaining taxa occuring most frequently in tropical regions. Two subgenera are recognised, viz. subgen. Dibaeis, comprising 11 taxa (D. arcuata in New Zeland); and subgen. Apoda, comprising four taxa (D. absoluta in New Zealand). Both species were earlier placed in Baeomyces (Galloway 1980a, 1985a, 1992d).
