Xanthoria polycarpa
Mycology
Thallus; < 3 cm diameter of small appressed rosettes of crenulate lobes, orange-yellow to yellow, with grey morphs mostly occurring in shade; forming small orbicular hummocks;obes broadening towards the apices, which are finely divided into many tiny lobe-ends <1 mm across; attached by hapters.
Soredia and isidia absent. Upper surface with crowded apothecia, often completely covering and obscuring the underlying thallus.
Anamorph: conidiomata pycnidia.
Conidia 2-3 μm long, ellipsoidal.
Teleomorph: ascomata apothecia, to 4 mm diameter, contorted, erect, peltate, often with short stalks, flat and orbicular when young with prominent raised margins, becoming contorted when old, the thalline exciple sometimes becoming excluded, grey-yellow (grey in shade).
Disc brown-orange.
Ascospores 11-15 × 6-8 μm.