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Pannaria rubiginosa (Thunb.) Delise
Family: Pannariaceae
[Amphiloma rubiginosum (Thunb.) Hepp,  more]
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Stephen Sharnoff  
Thallus: foliose, forming orbicular rosettes, up to 5 mm diam., on fibrous, well-developed hypothallus that sometimes extends as a blue-black zone around the thallus lobes: mostly concave, 3-4 mm wide, up to 8 mm long, with raised, whitish margins that are deeply incised upper surface: bluish gray to fawn-colored (olive-brown), smooth to pruinose or sometimes scabrous at the apices upper cortex: paraplectenchymatous, 40-50 µm thick Apothecia: common, frequently centrally, up to 1.5 mm; disc: red-brown, with a persistent, crenulate thalline margin; exciple: subparaplectenchymatous, 30-40 µm thick; hymenium: primarily hyaline but brown above, partially I+ blue (in vicinity of the asci), 110-150 µm high asci: clavate to subcylindrical, without internal amyloid apical structures, 8-spored ascospores: simple, colorless, broadly ellipsoid, with an epispore, 20-24 x 10-12 µm (with epispore) Pycnidia: not seen Spot tests: thallus K-, C-, KC-, P+ orange Secondary metabolite: pannarin. Substrate and ecology: on bark in cool-temperate forests World distribution: widespead in both Northern and Southern Hemispheres Sonoran distribution: at the upper limit of the oak forests in Sinaloa and Chihuahua, sometimes extending into the conifer forests. Notes: It is mostly confused with P. lurida and P. subfusca. The former species is usually broader and has duller lobes, that are heavily wrinkled when dry. In contrast, P. subfusca is a smaller, thinner, brownish, P- species. The separation from the smaller, often abundantly fertile P. malmei Dodge, which is best recognized by its smaller spores (12-15 x 8-9 µm), is more difficult.
Pannaria rubiginosa image
Troy McMullin  
Pannaria rubiginosa image
Troy McMullin  
Pannaria rubiginosa image
Troy McMullin  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
Stephen Sharnoff  
Pannaria rubiginosa image
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