Pseudocyphellaria pubescens

Detailed description

Thallus rather loosely attached, 5-15(-25) cm diam., ± orbicular, rosetteforming to spreading. Lobes rather thick, elongate-laciniate, to 10 mm wide, subdichotomously branching, margins entire or variously notched or incised, ± sinuous, distinctly thickened, conspicuously white-pubescent, without soredia, isidia or phyllidia. Upper surface bright lettuce-green when wet, pale yellowish-brown or buff when dry, smooth, coriaceous, ± distinctly reticulate-faveolate, ridges low, smooth, slightly scabrid centrally, ± pubescent or short, white-tomentose marginally and often also laminally, tomentum often abraded in patches, without soredia, isidia or pseudocyphellae. Medulla white. Photobiont green. Lower surface densely tomentose to margins, pale buff marginally, dark brown centrally. Pseudocyphellae yellow, conspicuous, large. Apothecia marginal or submarginal, subpedicellate, to 8 mm diam., disc shallowly concave, matt, black, with a fine, grey-white pruina in young fruits, margins pale flesh-coloured, entire at first, becoming distinctly incised-coronate, thalline exciple coarsely verrucose-areolate. Ascospores brown, 1-septate, 20-35 × 5-8(-10) µm.

Chemistry: Methyl evernate (tr.), tenuiorin (major), methyl lecanorate (tr.), methyl gyrophorate, gyrophoric acid (tr.), hopane-15α,22-diol, hopane-6α,7β,22-triol, norstictic (tr.), salazinic(tr.), stictic (major), cryptostictic (tr.), menegazziac (tr.) and constictic (minor) acids and traces of pulvinic acid, pulvinic dilactone and calycin.