Species: Physcia stellaris
Photos: On Salix. The Gearagh, Macroom, Co. Cork
Specimen left confirmed J. Douglass. Photo below confirmed A. Silverside.
Pale whitish-grey thallus, lobes without pseudocyphellae (but older parts of thallus may have very indistinct pseudocyphellae). Apothecia chestnut-brown to dark-brown. Small lobules sometimes present on lobes and apothecia margins.
Occurs on twigs and branches of semi-shaded or well-lit trees.
Cortex: K+ yellow. Medulla: K-
Similar: P. aipolia. Pseudocyphellae present. Medulla K+ yellow
Physcia stellaris February and September 2009