Flavoparmelia soredians (Nyl.) HaleThallus foliose, heteromerous, dorsiventral, closely attached, forming regular, up to 7(-10) cm wide, orbicular rosettes. Lobes 3-5(-7) mm wide, yellow-green, with farinose soredia in laminal, convex, often elongated soralia. Lower surface black centrally, brown peripherally, with simple rhizines. Upper cortex of tightly packed, anticlinally oriented hyphae, with a thin pored epicortex, the cell walls with isolichenan; medulla white; algal layer continuous; lower cortex paraplectenchymatous. Apothecia very rare, lecanorine, with a brown, imperforate disc and a sorediate margin. Epithecium brownish; hymenium and hypothecium colourless. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, <i>Lecanora</i>-type. Ascospores 1-celled, hyaline, ellipsoid, 17-19 x 7-8 µm. Pycnidia laminal, immersed, black. Conidia spindle-shaped. Photobiont chlorococcoid. Spot tests: upper cortex K-, C-, KC- or KC+ pale yellow, P-; medulla K+ yellow turning red tio brownish red, C-, KC+ red, P+ orange, UV-. Chemistry: upper cortex with usnic acid; medulla with salazinic acid.
