Brief Summary

Read full entry


 Thallus: orbicular to irregular, up to 3 cm across, usually firmly adnate also at the lobe tips; lobes: overlapping to separate, up to 1 mm wide, ± truncate, eciliate; upper surface: shining to dull, whitish gray to pale brownish gray, occasionally with a white pruina, sorediate; soredia: in laminal, crateriform soralia that sometimes are ± capitate, starting as cracks in the upper cortex; upper cortex: paraplectenchymatous; medulla: white; lower cortex: paraplectenchymatous, the lower part dark brown to black; lower surface: black except for the paler tips, with black rhizines; Apothecia: not seen in Sonoran material, elsewhere rare, sessile; margin: often sorediate; ascospores: brown, 1-septate, Pachysporaria-type, 21-27 x 9-12 µm; Pycnidia: not seen in Sonoran material, elsewhere rare, immersed; conidia: subcylindrical, 4-6 x 1 µm; Spot tests: upper cortex and medulla K+ yellow, C-, KC-, P+ yellow; Secondary metabolites: upper cortex with atranorin; medulla with atranorin and zeorin.; Substrate and ecology: growing on rocks in ± open situations; World distribution: SW North America, Mexico, East Africa and South America; Sonoran distribution: a species from moist canyons at intermediate elevations at scattered localities SE Arizona south through the Sierra Madre Occidental in Chihuahua, Sonora and Sinaloa and the southern mountains of Baja California Sur.; Notes: The black lower surface, the crateriform to capitate soralia and the convex lobes makes P. erumpens easily separated from other Physcia species in the area. From its close relative, P. sorediosa, it is separated by the type of soralia as P. sorediosa has marginal, small and delimited soralia. 


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

Belongs to 0 communities

This taxon hasn't been featured in any communities yet.

Learn more about Communities


EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!