Jamesiella
Type. Jamesiella anastomosans (P.James & Vězda) Lücking, Sérus. & Vězda [=Gyalideopsis anastomosans P.James & Vězda]
Description : Thallus crustose, thin, filmy, smooth or verrucose, pale glaucous-green, delimited by a pale-grey or white prothallus. Hyphophores present, producing diahyphae internally, the whole hyphophore dispersing passively and acting as a diaspore. Photobiont green, ? Trebouxia. Ascomata apothecia, orbicular, red-brown to black, ±pellucid when wet, with a persistent, often slightly raised proper margin; thalline margin absent. Proper exciple and hymenium composed of a continuous, loose networkof anastomosing paraphysoids in a common, gelatinous matrix. Asci cylindrical–clavate to ovate, apices thickened, 2- to 8-spored. Ascospores colourless, transversely septate to muriform. Conidiomata unknown.
Jamesiella, a recently described segregate of Gyalideopsis (q.v.), is a genus of four known species included in the family Gomphillaceae (Lücking et al. 2005, 2006) and differs from Gyalideopsis s.str. in the production of isidia-like hyphophores, that are interpreted as transformed, stipitate hyphophores where the diahyphae are produced internally rather than externally, and the whole hyphophore is dispersed as an entity and functions as a diaspore (Lücking et al. 2005: 165). The genus honours the British lichenologist, Peter W. James. One species is known from New Zealand.
