Irish lichens

Physcia stellaris
Order: Lecanorales       Family: Physciaceae

Species: Physcia stellaris

Growth type foliose.
Photos: On Salix. The Gearagh, Macroom, Co. Cork

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. The asci are 8-spored, spores brown, 1-septate, 15-22 x 7-11 Ám. Micrograph below.

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

Physcia stellaris

Physcia stellaris
Physcia stellaris February and September 2009

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