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Ochrolechia laevigata (Räsänen) Verseghy ex Kukwa
Family: Ochrolechiaceae
Ochrolechia laevigata image
Stephen Sharnoff  
Thallus: crustose, rarely verruculose, following contours of substrate; prothallus: absent areoles: very thin, sometimes becoming thicker and rimose in spots surface: white to pale yellow or pinkish gray, smooth and continuous, with a distinct margin, esorediate Apothecia: lecanorine, sessile, 1.2-3(-4.5) mm in diam. disc: light orange, less frequently yellowish pink, epruinose, rugose, K-, C+ red, KC-, P-, UV- margin: concolorous with thallus, usually prominent, thick, smooth, without an excipular ring of pink tissue, K- or +brown, C+ red, KC+ red, P- amphithecium: medulla thick and lax, radiate; algal layer virtually absent, or occurring as discontinuous clumps, especially in upper lateral margins; cortex +decomposed externally, variable in thickness, merging with amphithecium, radiate or not, 85-110 µm thick exciple: 60-70 µm thick, often distinct from hypothecium hymenium: (280-)310-400(-430) µm tall; hypothecium: 70-90 µm thick, with an algal layer below asci: 6- to 8-spored ascospores: rarely developed, hyaline, simple, ellipsoid, 34-52 x 20-26 µm Pycnidia: not seen Spot tests: thallus: K-, C-, KC-, P-, UV-; medulla: K-, C- (sometimes only the stipe), KC-, P- Secondary metabolites: gyrophoric, olivetoric & lecanoric (trace) acids (constant), 4-O-demethylmicrophyllinic acid (frequent accessory compound), triterpenoid substances, common in Alnus bark, can appear on TLC plates. Substrate and ecology: almost exclusively on smooth-barked, deciduous trees, such as Alnus or Acer World distribution: endemic to North American west coast, from Alaska to California Sonoran distribution: coastal southern California. Notes: Ochrolechia laevigata differs from O. subpallescens in that the latter has a thicker, more verruculose thallus and unbroken algal layer under the hymenium, while the thick margin of O. laevigata almost lacks algae.
Ochrolechia laevigata image
Stephen Sharnoff  
Ochrolechia laevigata image
Stephen Sharnoff  
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image
Ochrolechia laevigata image