Ramalina fastigiata  

Thallus usually erect, densely tufted and richly branched, pulvinate, lobes 1-5 cm long, 3-8 mm wide, occasionally becoming lax and pendent, pale- to dull grey-green. Branches cylindrical or somewhat angular, slightly flattened, hollow, appearing inflated, with a web-like lax medulla and cartilaginous subcortex. Surface sometimes longitudinally fenestrate and lacunose. Isidia and soralia absent. Photobiont trebouxioid.
Anamorph: not recorded.
Teleomorph: ascomata apothecia, terminal, usually numerous, often appearing at one level (umbel-like), sometimes totally obscuring the thallus lobes, short-stalked. Thalline margin soon becoming ± excluded. Disc concave, becoming flat or convex when mature, concolorous with or slightly paler than the thallus, pruinose. Epithecium nt clearly differentiated, sometimes appearing dark in water mounts. Hypothecium hyaline. Interascal tissue of fairly thick-walled paraphyses, copiously branched especially in the apical region, within a colourless gel. Asci clavate, Bacidia-type, 8-spored. Ascospores 12-15 (-18) × 5-6 (-7) μm, mainly kidney-shaped, rarely broadly ellipsoid, 1-septate, hyaline, quite thick-walled, smooth, without an epispore or gelatinous sheath or appendages.
Chemistry: medulla C–, K–, KC–, Pd–, UV–, (usnic and evernic acid complex).