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Platismatia wheeleri Goward, Altermann & Björk
Nomenclature
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Family: ParmeliaceaeGenus: Platismatia
Media
SUMMARY
Mycobank MB 517806
Thallus foliose, up to 5–10 cm across, corticate above and below; lobes ascending, loosely attached from the base, proportionately rather broad, rounded to irregular in outline, mostly 6–20 mm wide, thin. Upper surface whitish, smooth to weakly pitted, without pseudocyphellae, matt or at any rate not distinctly shiny, I–. Soredia present, fine, powdery, uniform in size, borne in continuous long marginal soralia, also sometimes present over upper or lower surface in more or less circular soralia; marginal soralia strongly sinuous even when young. Lower surface varying from brown to more often black, usually with a reticulum of narrow raised ridges, dull to occasionally shiny toward the tips, lacking rhizines or with sparse unbranched rhizines. Upper cortex 16–26 µm thick, prosoplectenchymatous; medulla white, 100–170(–200) µm thick, lower cortex 100–150 µm thick, prosoplectenchymatous, I+ purplish; photobiont cells Trebouxioid. Apothecia and pycnidia unknown. Secondary chemistry: atranorin (cortex K+ yellow) and caperatic acid (by TLC).