Very similar to Ochrolechia parella and O. szatalaensis. Following Wirth I assume that O. parella only grows on rock and O. pallescens is a corticolous species.
No soredia.
Spot reactions separate O. pallescens (Thallus K-) of O. szatalensis (Tallus K+ yellow).
On Larix decidua, near the road in more illuminated places, Fontromeu, Oriental Pyrenees, France.
Good pictures in:
Vicente Calatayud (2000) Guía de lóquenes epífitos.
C. Pérez Valcárcel et alter (2003) Guía dos Liques de Galicia.