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Platismatia glauca
Nomenclature
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Family: ParmeliaceaeGenus: Platismatia
SUMMARY
Thallus 1-6 (-15) cm diam., often forming extensive patches, rather thin and papery, especially when dry. Lobes to 1.5 cm wide, wavy, irregularly indented, margins ascending, entire or sub-lobulate, often with marginal clusters of simple to coralloid, much branched, isidia or in part, granular soredia. Upper surface pale to dull grey, often with a brown tinge or totally tinged brownish (in exposed sites), ± unchanged or ± greenish in colour when wet, smooth to wrinkled or slightly ridged, without pseudocyphellae. Lower surface entirely black, or brown or white (shade morphs), especially towards the margin, with few to many, scattered, simple or branched rhizines. Photobiont trebouxioid.
Anamorph: conidiomata pycnidia, marginal, immersed. Conidia cylindrical, not swollen at apices.
Teleomorph: ascomata apothecia, very rare, 5-9 mm diam., marginal, with a red-brown disc. Thalline exciple thin, ± excluded at maturity. Hymenium I+ blue. Hypothecium thin, I+ blue, usually lacking algae below. Asci 8-spored, Lecanora-type. Ascospores 3.5-8.5 × 3-5 μm.
Chemistry: cortex K+ yellow (atranorin), medulla C–, K–, KC–, Pd–, UV– (caperatic acid).