Description: This clearly lobed, greenish-brown, foliose epiphyte is a species of well-illuminated trees in parkland or wayside situations. It resembles Physconia grisea in the size of the thallus (about 5-8cm on average) and in the slightly overlapping lobes — much divided and pruinose (icing-sugar-like sprinkling) near the tips, and the marginal granular soredia. In P. enteroxantha, the soredia are coarse, pale brown or yellowy and the medulla is also of a dull yellow colour. This yellowness shows through the lobes giving the whole thallus a rather jaundiced look. When tested the medulla is K + yellow, not K- as in P. grisea. North and east Ireland mainly.

Key Identification Features:

• Its overall dull yellow colour; the marginal soredia, yellowish and granular
• Medulla and soredia, K + bright yellow.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Physconia enteroxantha at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Physconia enteroxantha at iNaturalist World Species Observations database.