Pseudocyphellaria montagnei

Detailed description

Thallus ± orbicular, closely attached in rosettes or spreading, to 12 cm diam. Lobes rounded, ± radiating, imbricate, margins entire or delicately notched or incised, sinuous or ragged-phyllidiate. Upper surface glaucous-green to olivaceous when wet, pale greyish-green when dry, undulate or shallowly faveolate, lacunose, ridges smooth, matt or shining, without soredia, maculae or pseudocyphellae, often phyllidiate. Phyllidia dentate-subcoralloid, flattened, undulate, squamiform, marginal and laminal. Photobiont green. Medulla white. Lower surface pale yellowish-buff to whitish, slightly darker centrally, ± glabrous or with a sparse, thin, pale tomentum, wrinkled-bullate in parts, or ± papillate. Pseudocyphellae inconspicuous, very sparse, scattered, minute, erupting on ridges and papillae, decorticate area yellowish, or white. Apothecia laminal or marginal, sparse to moderately frequent, sessile to subpedicellate, 2-5 mm diam., disc matt, smooth, black, epruinose, margins thin, entire to crenate-striate to phyllidiate, pale. Pycnidia frequent, scattered, black, punctiform, minute. Ascospores brown, polaribilocular, fusiform-ellipsoid, 24-31 × (5-)7-10 µm.

Chemistry: Methyl evernate, tenuiorin, methyl gyrophorate, evernic, hopane-6α,7β,22-triol, norstictic (tr.), stictic, cryptostictic (tr.), constictic, hypostictic (tr.) and hyposalazinic (tr.) acids.