Physconia enteroxantha Growth type foliose Chemical results: Medulla K+ yellow Found on well-lit, nutrient-rich bark of parkland and roadside trees. Thallus is irregular in shape (rarely orbicular) with small, +/- overlapping greyish or green-brown lobes, +/- pruinose. Secondary lobules are sometimes present in mature specimens. Lower surface brown to black with numerous black rhizines. Marginal +/- yellowish soralia but apothecia very rare. Medulla dull yellow. Similar: Physconia perisidiosa, soredia and isidia, medulla negative

Physconia enteroxantha
Kingston Lacy, Dorset. November 2016