Pseudocyphellaria fimbriata

Detailed description

Thallus rather loosely attached, orbicular to spreading, to 25 cm diam. Lobes dissected, irregularly elongate-laciniate, branching subdichotomous to irregular or subimbricate, margins irregular, lacerate-denticulate, white-pubescent, subascendent, ± copiously phyllidiate. Upper surface bright lettuce-green when wet, yellowish-grey or olivaceous or brownish or reddish when dry, smooth, coriaceous to somewhat scabrid-areolate, even or weakly undulate, without soredia, maculae or pseudocyphellae. Phyllidia mainly marginal occasionally laminal, ± palmately divided, flattened, dorsiventral, upper surface as in main lobes, ± finely white-pubescent, especially at apices. Medulla white, 350 µm thick, rather loose. Photobiont green, 10-13.5 µm diam., in a rather irregular layer, 100-150 µm thick. Apothecia rather sparse, sessile, marginal or submarginal, often associated with phyllidia, to 6 mm diam., disc red-brown to dark brown, smooth, matt, epruinose, with a thick, persistent, raised, crenulate-scabrid margin, thalline exciple massive, verucose-areolate, red-brown. Ascospores 1-septate, brown, fusiform-ellipsoid, 20-25 × 8-11 µm.

Chemistry: 7β-acetoxyhopane-22-ol, hopane-7β, 22-diol (tr.), hopane-15α,22-diol.