Slideshow image
Pertusaria rubefacta Erichsen
Family: Pertusariaceae
Pertusaria rubefacta image
Stephen Sharnoff  
Thallus: continuous to fissured, with thin to moderately thick verrucae; margins: entire, unzoned upper surface: yellow-gray to greenish yellow, smooth, tuberculate to rugose-plicate, shiny or dull, epruinose; lacking soredia or isidia fertile verrucae: concolorous with thallus, pertusariate to frequently falsely lecanorate, numerous and crowded, often fused (2-5) in mutually deformed groups, c. 0.4-2.6 mm in diam.; ostioles: 1 or 2-8 per verruca, level to mostly sunken, soon dilating to form a pseudolecanorate disc Apothecia: 1-5 per verruca; disc: black, grayish pruinose or epruinose; epithecium: dark brown to black-brown, K+ strongly violet; hypothecium: hyaline or yellowish asci: clavate, 260-420 x 50-90 µm, (6-) 8-spored ascospores: hyaline, oval to ellipsoid, 55-110 x 30-55 µm; spore wall: 2-layered; outer spore wall: c. 2-4 µm thick; inner spore wall: 2-12 µm thick, smooth; apices: up to 25 µm thick Pycnidia: not seen Spot tests: K+ yellow to red, C+ orange, KC-, P+ yellow to orange, UV+ orange-red Secondary metabolites: norstictic and thiophaninic acids (both major), connorstictic acid, 2-chloro-6-O-methylnorlichexanthone, and 4-chloro-6-O-methylnorlichexanthone, and gyrophoric acid (all minor). Substrate and ecology: on bark of deciduous trees, mostly Quercus World distribution: only known from the western Hemisphere and shows a disjunct distribution, occurring both in the east and southwest part of North America Sonoran distribution: coastal Califorina at 150-400 m and southern Baja California Sur. Notes: This species is characterized by a yellowish thallus, ascomata with sunken ostiola which soon dilate and fuse to form a pseudolecanorate disc, a K+ violet epithecium, 8-spored asci and the presence of norstictic and thiophaninic acids. As discussed above, the species is very similar to P. hymenea and best distinguished by its different chemistry.
Pertusaria rubefacta image
Samuel Brinker  
Pertusaria rubefacta image
Stephen Sharnoff  
Pertusaria rubefacta image
Pertusaria rubefacta image
Pertusaria rubefacta image
Pertusaria rubefacta image
Pertusaria rubefacta image
Pertusaria rubefacta image