Pseudoparmelia kalbiana

The lichen has a leafy (foliose) thallus, pale to yellow-gray in colour (older individuals are browner), measuring 5–10 cm (2.0–3.9 in) wide with crowded, overlapping lobes 2–7 mm wide. It has a wrinkled, tan to brown lower surface and brown rhizines that serve as holdfasts to attach it to its substrate. The apothecia (reproductive organs) are common in this species; they are 2–3 mm wide with a concave, red-brown to dark brown disc. Its ascospores are ellipsoid and measure 9–12 by 7–8 μm. Its conidia (asexual spores) are bifusiform (i.e., threadlike with a swelling at both ends), measuring 6–10 by 0.7–1.0 μm.^[1]

Pseudoparmelia kalbiana contains secalonic acid as a major secondary chemical in the cortex with atranorin and chloroatranorin as minor metabolites. The medulla contains secalonic acid A and hypostictic acid as major metabolites and hyposalazinic acid as a minor component.^[1]

Pseudoparmelia kalbiana is usually found growing on trees, rarely on rocks. The lichen has been recorded at elevations between 100 and 1,000 m (330 and 3,280 ft). It has been reported from Brazil and Venezuela.^[1]