[10] The lobes of this lichen, which are the leaf-like or flattened branches that make up its thallus, tend to lie flat against the surface they grow on but can also rise up slightly.

In comparison to X. fulva, Gallowayella oregana generally has a larger size with lobes that are both broader and longer, alongside a more substantial upper cortex.

Unlike G. fulva, which may form rounded, soredia-filled structures reminiscent of "bird nests" at the tips of its lobes, X. oregana typically produces soredia along the edges and just inside the margins of the cortex.

Additionally, Xanthomendoza oregana does not form the structured, rosette-like thallus seen in Xanthoria ulophyllodes, which is characterised by tightly appressed marginal lobes.

[2] Unlike many other lichens and bryophytes that share this transatlantic distribution, Xanthomendoza oregana primarily inhabits lowland temperate areas.

In southern Sweden, for example, it is commonly found on trees in parks and churchyards, indicating its preference for semi-urban environments where there is sufficient light and air circulation.