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Pertusaria flavicunda Tuck.
Family: Pertusariaceae
Pertusaria flavicunda image
Stephen Sharnoff  
Thallus: fissured to fissured-areolate, with thin to moderately thick verrucae; margins: entire, unzoned upper surface: green-yellow to sulfur-yellow, smooth to tuberculate or rugose-plicate, dull, slightly pruinose; lacking soredia or isidia or superficially sorediate fertile verrucae: concolorous with thallus, lecanorate, numerous, often fused, c. 0.5-1.8 mm in diam. Apothecia: 1 (-2) per verruca; disc: brown to blackish brown, sunken, yellowish pruinose; epithecium: yellow-brown to brown, K+ violet; hypothecium: yellowish to brown asci: cylindrical, 150-300 x 50-70 µm, 2 (-4)-spored ascospores: hyaline, ellipsoid to fusiform or oval, 50-115 x 25-60 µm; spore wall: c. 8-28 µm thick, 1-layered Pycnidia: not seen Spot tests: K+ yellow, C+ orange, KC-, P+yellow to orange, UV+ orange-red Secondary metabolites: stictic and thiophaninic acids (both major), constictic acid, 2-chloro-6-O-methylnorlichexanthone, and 4-chloro-6-O-methylnorlichexanthone (all minor). Substrate and ecology: The species grows on siliceous rocks at the coast and the coastal mountains at 0 -200 m and some specimens were collected at an elevation of up to 750 m World distribution: endemic to western North America Sonoran distribution: coastal southern California and Baja California and at scattered inland locations in southern Arizona and Sonora. Notes: This taxon can easily be recognized by the yellowish thallus, large lecanorate verrucae with pruinose discs, ± 2-spored asci, and the presence of stictic and thiophaninic acids. Some morphotypes of P. tejocotensis may be similar, but this species is distinguishable by poriform apothecia, 4-spored asci, and the presence of depsides instead of stictic acid. Pertusaria flavicunda is generally a uniform species, but some populations differ in producing soralia instead or in addition to apothecia. The sorediate morphotypes do not differ in any other morphological or chemical characters.
Pertusaria flavicunda image
Stephen Sharnoff  
Pertusaria flavicunda image
Stephen Sharnoff  
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image
Pertusaria flavicunda image