Fellhanera gyrophorica

The thallus of Fellhanera gyrophorica is corticolous, often forming large, noticeable patches or streaks along bark fissures. Its colour ranges from pale yellowish-green to green with a bluish tinge. The thallus consists of goniocysts that are finely farinose (like a whitish mealy powder) or scurfy granular, and it can be thin or thick and granular-warted when well-developed. The margin of the thallus is not well defined, lacking a prothallus. The photobiont is likely a Chlorococcaceae species, with green, spherical cells. Pycnidia are a prominent feature, always present, and can be sessile or slightly stalked. They are pinkish to pale orange-brown, with a slightly pruinose outer wall. They typically react C+ (red) due to the production of gyrophoric acid. Conidia are typically obpyriform in shape.

This species is primarily found in Central Europe, with occurrences in Austria, Lithuania, Luxembourg, Poland, Switzerland, and Ukraine. It is typically found in well-preserved, shady, and humid broad-leaved forests at low elevations. Fellhanera gyrophorica grows on various deciduous and coniferous trees and is often associated with lichens such as Anisomeridium polypori, Graphis scripta, and Micarea prasina. Its habitats indicate a high ecological continuity, often featuring rich epiphytic lichen floras.

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