Felipes leucopellaeus

Felipes leucopellaeus is a crustose lichen. Its thallus is whitish to pale yellow or fawn in colour, variously described as being flaky (scurfy), minutely granular (leprose) or somewhat "cobwebby" (arachnoid) in appearance. Fresh growth often has a pinkish tinge, and the lichen has no distinct margin. Its apothecia (the lichen's spore-carrying structures) are dark brown to black in colour, ranging in shape from generally rounded to star-like or lobed.

Felipes leucopellaeus is a corticolous lichen, growing on tree bark – particularly acidic tree bark. In Europe, it is found on the bark of mature birch (Betula), oak (Quercus), pine (Pinus) and holly (Ilex) trees, as well as occasionally on old common heather (Calluna) stems. In North America, where it was first recorded in 1988, it has been found on the bark of Betula alleghaniensis (yellow birch) and Picea rubens (red spruce). It is uncommon in many of the places it occurs. In Italy, it is considered critically endangered, and it is a red-listed species in Poland and Lithuania. It is sometimes attacked by the lichenicolous species Chaenothecopsis vainioana.