Ingvariella Guderley & Lumbsch
Type : Ingvariella bispora (Bagl.) Guderley & Lumbsch [Urceolaria bispora Bagl.]
Description : Thallus crustose, uniform, closely attached, rimose–areolate. Photobiont green, Trebouxia. Ascomata apothecia, hemiangiocarpic, suburceolate, appearing lecideine, blackish. Excipulum proprium absent, its place taken by a pseudoexcipulum formed of degenerating brown-pigmented hymenial elements. Hymenium hyaline I−. Hypothecium 10–15 μm thick, hyaline. Hamathecium of simple, lax paraphyses. Asci cylindrical, 1–4-spored. Ascospores hyaline to brownish or grey-blue, broadly ellipsoidal.
Ingvariella is a monospecific genus, described to accommodate the former Diploschistes bisporus (Guderley et al. 1997; Lumbsch 2004). Ingvariella is segregated from Diploschistes on the basis of the character of the apothecial margin. No proper exciple is formed in Ingvariella bispora, rather, the apothecial margin is formed from hymenial elements including paraphyses and asci. It is included in the family Thelotremataceae (Eriksson et al. 2004; Pennycook & Galloway 2004; Eriksson 2005). The genus is named for the Swedish lichenologist Ingvar Kärnefelt.
